- Short answer
- Not with native quantity rules, which count each variant alone; a validation Function (a custom one needs Shopify Plus) or an app can enforce it.
- Native quantity rules
- Minimums apply to product variants, so each variant has to meet its own minimum.
- Order-level minimum
- Checkout Blocks can require a minimum order subtotal, a value rather than item count; Shopify's pages differ on the plan.
- App Store apps
- Public apps with functions work on any plan, except as noted on API pages; confirm the listing covers B2B checkout.
- Custom Function
- Only Shopify Plus stores can use a custom app that contains Shopify Function APIs.
Can native B2B quantity rules add up mixed variants?
No. Shopify's quantity rules page says minimums “apply to product variants”, so each variant has to meet its own minimum. Our answer on per-variant quantity rules shows the example.
Shopify's B2B checkout page does point to a whole-order minimum, but by value, not item count: order value limits in the free Checkout Blocks app, a minimum order subtotal for all customers or only B2B companies.
Which routes can enforce a minimum across variants?
The first route is a Shopify Function. The Cart and Checkout Validation Function API docs say:
To validate a cart and checkout, server-side, you can only use the Cart and Checkout Validation Function API.
Its use cases include “Provide B2B product minimums, maximums, and multiples” and “Provide B2B location order minimums, maximums, or credit limits”, and it lists B2B, cart and checkout as supported. These are things a developer builds, not settings in your admin.
The second route is an App Store app: order-limit apps are their own class, with listings built around minimum order quantities and order limits. Public App Store apps can contain functions too, which is why the check below matters.
Do you need Shopify Plus, and what should you check?
For a custom build, yes. Per Shopify's Functions availability rules, only Shopify Plus stores can use custom apps that contain Function APIs, while public App Store apps with functions work on any plan, except as noted on individual API pages. Our guide covers which Functions features need Plus.
A validation function runs server-side and supports checkout, so it holds the minimum at checkout, not only in your theme's cart. For an app, confirm on its listing that it enforces the minimum in B2B checkout before you install it.
For order value limits, Shopify's sources differ on the plan: the Checkout Blocks help page makes everything except content blocks on the Thank you and Order status pages Plus-only, while the App Store listing shows order value limits without a Plus label.
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