How to Sell Wholesale by Case Pack in Shopify

Many wholesale products ship in fixed case packs, so an order entered in single units creates picking errors and broken cartons.

Model the case pack clearly

Decide what a buyer is actually purchasing: an inner pack, a master carton, or a single eligible unit. Document the pack quantity for each product and whether partial packs are ever allowed, because this rule drives inventory, picking, and freight.

Represent the pack consistently in Shopify, whether the saleable unit is the case itself or the individual unit with a pack-multiple constraint applied at order entry. Avoid mixing the two models within the same catalog, which is a common source of fulfillment errors.

Enforce pack-multiple ordering

Show the rule before checkout rather than rejecting the order at payment. A clear message such as 'Sold in cases of 24. Add 18 more units to reach 2 full cases.' lets buyers fix the cart without contacting sales.

Keep inventory and pricing consistent

Make sure on-hand inventory reflects how the product is counted and shipped. If you stock by case but sell by unit, confirm that the available quantity and the pack rule agree so the store does not promise broken cases it cannot fulfill.

Apply per-unit or per-case B2B pricing through the company catalog rather than calculating prices in the ordering screen. The order form should display the negotiated price and let Shopify checkout remain the source of truth for what the buyer pays.

Make case-pack ordering fast for repeat buyers

• Let buyers enter case counts directly instead of multiplying units by hand.
• Accept spreadsheet paste or CSV upload with SKU and case quantity columns.
• Validate pack multiples on every row and flag exceptions for correction.
• Show units, cases, and order value together so the total is unambiguous.
• Preserve valid rows when one row violates the pack rule.

For high-line-count replenishment, combine pack-multiple validation with a bulk entry workflow so a buyer can submit a full carton order in one pass while the store still enforces how each product ships.