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Wholesale inventory becomes difficult to control when several products look similar, cartons are stored in different places, or the same merchandise is offered through more than one sales channel.
A retailer may know that 500 units arrived but still be unable to answer basic questions quickly:
A practical SKU and bin location system creates one reliable identity and one documented location for each inventory item. It can be used by discount stores, independent retailers, eBay sellers, Walmart Marketplace sellers, Whatnot sellers, exporters, and businesses that sell through several channels.
The system does not need to be expensive or complicated. It does need to be consistent.
A stock keeping unit, commonly called a SKU, is an internal code that a business assigns to a specific product or product variation.
A wholesale inventory SKU system connects that code with the information needed to receive, store, sell, count, and analyze the item. The record may include:
The SKU identifies the item in the buyer’s own system. The bin location identifies where that inventory is stored.
These terms are related, but they are not interchangeable.
A SKU is created by the retailer for internal use. Two retailers can sell the same product while using different internal SKUs.
A Global Trade Item Number, or GTIN, is a standardized product identifier. A UPC is a common barcode format that carries a GTIN for retail scanning in the United States and Canada.
GS1 US states that each product variation requires a unique barcode. Its example shows that a shirt offered in three sizes and three colors requires nine product identifiers. GS1 US barcode guidance
A barcode is the machine-readable symbol that represents data. A manufacturer UPC barcode can identify the retail product. A business can also print an internal barcode that represents its own SKU or location code.
Do not replace or alter a manufacturer’s product identifier merely to fit an internal system. Record the manufacturer’s identifier in a separate field and connect it to the internal SKU.
Before creating codes, decide what differences require separate inventory records.
Create a separate SKU when a difference affects how the product is stored, priced, described, sold, or counted. Differences may include:
For example, a single unit and a six pack should not share a SKU. A sealed product and the same product with damaged retail packaging should not share a sellable inventory record if they will be described or priced differently.
The objective is not to create as many SKUs as possible. It is to prevent materially different inventory from being combined under one number.
A SKU should be unique, readable, and easy to enter. Avoid codes that are so detailed that employees cannot use them consistently.
One possible structure is:
Category – Brand – Item – Variation
Example:
TOY-HAS-0142-BLU
This could represent:
Another product could use:
HOU-CUI-0088-12P
This could represent a housewares item, a brand abbreviation, an internal sequence, and a 12-piece pack.
Use rules that work across the systems the business actually uses:
A SKU does not need to contain every product fact. The complete product record should hold the full description, identifiers, costs, dates, and notes.
Do not build the current shelf location permanently into the product SKU. Products move. The identity of the product should remain stable when its location changes.
Use a separate location structure such as:
Zone – Aisle – Bay – Shelf – Bin
Example:
A-03-02-B-04
This could mean:
For pallet storage, a shorter code may be enough:
P-04-12
This could identify pallet zone 4, position 12.
Use signs that can be read from the normal picking path. The physical label and the inventory record must use the same exact format.
Not every received unit should immediately enter sellable stock.
Create separate locations or statuses for:
Example codes could include:
Separating these units prevents the business from listing or promising inventory that is not available for normal sale.
Every active SKU should have one master record. A spreadsheet can work for a smaller operation, while a point of sale, warehouse, or inventory system may be more appropriate as volume increases.
At minimum, include:
| Field | Purpose |
|---|---|
| Internal SKU | Stable identifier created by the business |
| Product name | Clear description used by staff |
| Brand | Brand shown on the product |
| Model or style | Exact variation reference |
| UPC, EAN, or GTIN | Manufacturer or standardized product identifier |
| Pack count | Number of sellable units in the package |
| Condition | New, open box, packaging damage, or other documented state |
| Primary location | Normal picking location |
| Overflow location | Additional stock location when used |
| Quantity on hand | Physical units recorded in the system |
| Reserved quantity | Units committed but not yet deducted |
| Hold quantity | Units unavailable for normal sale |
| Available quantity | Units that can be offered for sale |
| Unit cost | Merchandise cost before additional expenses |
| Landed cost | Allocated cost after applicable inbound expenses |
| Acquisition date | Date the inventory was received or accepted |
| Lot or date code | Used when relevant to the product |
| Channel identifiers | Listing or offer references used by each sales channel |
The IRS explains that good records can show which items are selling and help a business prepare financial statements and tax returns. It also states that supporting inventory documents should show the amount paid and that the purchase was for inventory. IRS Publication 583
Consult a qualified accounting or tax professional regarding the records and valuation method required for the business.
The number physically present is not always the number available to sell.
Use a formula such as:
Available quantity = on-hand quantity – reserved quantity – hold quantity
Example:
600 – 45 – 18 = 537 available units
If the business sells through several channels, the 537 units represent the shared available pool. Do not give every channel a separate quantity of 537 unless each channel has dedicated physical inventory.
A safety buffer can reduce overselling when systems do not synchronize immediately:
Channel-available quantity = available quantity – safety buffer
If the safety buffer is 12 units:
537 – 12 = 525 channel-available units
The correct buffer depends on sales velocity, system synchronization, cancellation exposure, and the speed of physical picking.
The internal SKU should be the common reference across the business, even when sales channels assign their own listing or item numbers.
Maintain a channel map with fields such as:
| Internal SKU | Channel | Listing or item ID | Quantity rule | Status |
|---|---|---|---|---|
| TOY-HAS-0142-BLU | Retail store | POS-4381 | Shared pool | Active |
| TOY-HAS-0142-BLU | eBay | Listing ID | Shared pool | Active |
| TOY-HAS-0142-BLU | Walmart Marketplace | Item ID | Shared pool | Active |
| TOY-HAS-0142-BLU | Whatnot | Listing reference | Event allocation | Active |
Marketplace fields and requirements can change. Review the current rules in each seller account before uploading or editing inventory.
Avoid creating a different internal identity for the same physical product on every channel. That makes it difficult to understand total exposure and can create duplicate inventory counts.
An exception may be appropriate when inventory is physically separated or committed to one channel. Document the allocation and transfer process so units are not counted twice.
The right label depends on the picking unit.
Consider including:
Consider including:
Consider including:
Use large text and a scannable code. Place the label where staff can scan it without moving merchandise or entering an unsafe area.
Do not cover legally required product information, expiration dates, lot codes, serial numbers, or manufacturer barcodes with an internal label.
The inventory record should begin while the shipment is being received, not days later from memory.
Use this workflow:
Use NexDeal’s wholesale inventory receiving checklist to document pallet counts, carton counts, condition, barcodes, shortages, and adjusted sellable yield.
An inventory system becomes unreliable when products are moved without updating their location.
Each movement record should identify:
Useful movement reasons include:
Do not solve a mismatch by changing the number without a reason. The adjustment history should explain what happened.
A cycle count checks selected inventory on a repeating schedule. It helps identify errors while the related activity is still recent.
A simple schedule may be:
During a count:
Use accuracy as an operating measurement:
Inventory accuracy rate = correctly counted records ÷ records counted × 100
If 96 of 100 counted SKUs match:
96 ÷ 100 × 100 = 96% inventory accuracy
The four errors still require investigation. A percentage alone does not explain whether the problem came from receiving, picking, returns, channel synchronization, or an unrecorded move.
Review the master file regularly for:
Correct the source record before copying data to additional channels. Otherwise, the same error spreads into listings, counts, purchase decisions, and financial reports.
Suppose a retailer receives 720 units from a NexDeal order:
The retailer creates:
The sellable quantity is:
720 – 24 – 12 = 684 sellable units
After reserving 60 units:
684 – 60 = 624 available units
The physical locations are recorded as:
Each sales listing maps back to the blue or black internal SKU. The manufacturer identifier remains in its own field. If the sellable products move to another aisle, the location changes but the SKU remains the same.
Start by reviewing NexDeal’s Newest Daily Deals and the specific offer. Record the exact product, condition, MOQ, available quantity, price, and displayed identifiers.
Review How NexDeal Works before ordering. As reviewed September 17, 2026, NexDeal states that product availability can change quickly, that it confirms the order and final quantity before payment, and that the buyer arranges the carrier and sends the bill of lading.
After the inventory arrives:
New buyers can complete the NexDeal customer application before reviewing available opportunities.
Before the inventory is offered for sale, confirm:
A good SKU and bin location system should make the correct action easier. Staff should be able to identify the product, locate it, count it, pick it, and explain its status using the same record.
No. A SKU is an internal identifier created by a business. A UPC carries a standardized product identifier used across retail systems. Keep both in the product record when available.
Usually no. Store the bin location in a separate field so the product can move without changing its identity.
Yes when the variation must be counted, priced, described, or sold separately. GS1 also states that each product variation needs a unique barcode when standardized identifiers are being assigned.
Some businesses do, but a separate internal SKU can provide more control over condition, pack count, bundles, and channel mapping. Do not alter or invent manufacturer identifiers.
Use one master available quantity, subtract reserved and hold units, maintain a safety buffer when appropriate, and synchronize or reconcile channel quantities frequently.
Count frequency should reflect value, sales velocity, error history, and risk. Fast-moving or high-value items generally deserve more frequent cycle counts than slow-moving merchandise.
This article provides general business information and does not constitute accounting, tax, legal, regulatory, or financial advice.
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