How do I add a script to prevent combining Shopify discounts with other discount campaign?

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How to disable all discount codes on Shopify by product tag using script？

I've adjusted the price directly to the compare-at price, but I don't want the buyer to use another discount code again as this will result in duplicating the discount, how do I do this?

How do I add a script to prevent this?

In which location do I add the script?

I am using the basic Shopify.

Thank you!