You can ensure that discount codes are not applied in addition to already discounted items in 2 ways:
In the Shopify admin
Creating a collection:
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Create a new collection named "Eligible for Discount".
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Under 'Collection type', choose 'Automated' and set the condition to include specific products. For instance, with the below conditions, you can include all products not on sale.
- Product price is greater than 0.
- Products where the Compare at price is empty.
Updating discounts:
- From your Shopify admin, go to 'Discounts'.
- If you're creating a new discount, click 'Create discount'. To edit an existing one, select the discount from your list.
- In the discount settings, under 'Applies to', select 'Specific collections'.
- Choose the "Eligible for Discount" collection you created earlier.
Ouiteo's Ultimate Collection Manager
Creating a collection:
- Create a new collection named "Eligible for Discount".
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Under the "Select what products to add" section, set the condition to include specific products. For instance, with the below conditions, you can include particular products not on sale.
- Include either Product type or Vendor name.
- Exclude Discount % is greater than 0.
Updating discounts:
To update or create a new discount code on Shopify, refer to the steps outlined in the section Updating discounts of the article.