You can give your shoppers an option to apply an additional discount code on top of the custom price for the product they are buying. Here are the steps to set this up and allow additional discount codes:
1. Select 'General Settings'.
2. Switch the toggle to 'on' for 'Allow customers to use a discount code in conjunction with their discounted cart.'
3. Once it is switched on, select one of the marked options and click on the 'Sync Discounts' button.
4. Hit the Save button.
5. Syncing takes a few minutes but once done, shoppers can apply additional discount codes over the custom pricing.
Need any more help? Let us know.