You can create a discount code for specific variants. When you create a new discount, you’ll want to select ‘Applies To > Specific Product’ and select the variants you’d like to apply the discount to.
Then you can use this app Stackable Discounts to allow multiple discounts at the checkout.
Or you can have a look at this app Automatic Discounts & Gifts. The app supports both automatic discounts based on product variants and stacked discounts.
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Thank you for reaching out to the Community! To successfully offer volume discount pricing to customers, I would recommend looking to the Shopify App Store. There are various apps available that can assist with generating volume pricing (similar to the example above) that can be used and/or offered as a discount. I’ve listed below a few apps you can check out:
I just noticed that you didn’t accept the solution yet. So I wonder if you are still looking for the app or work around this? Here is the app that has the exact functionality that you are looking for.
iCart Cart Drawer Cart Upsell app has a volume discount option to show it for each variant and for a fixed amount discount and percentage discounts.
Hi, I’d also like to pitch a newer app, Volume Discount Mojo, which handles quantity breaks extremely well. It integrates with Shopify newest discounts, so that it shows properly in Cart and Checkout: https://apps.shopify.com/volume-discount-mojo