HikaSerial - How to assign specific products to a serial

-- url of the page with the problem -- : www.willowcrossley.com/
-- HikaShop version -- : 4.4.3
-- HikaSerial version -- : 4.0.0
-- Joomla version -- : 3.10
-- PHP version -- : 7.4.18

Hi, I would like to restrict a voucher that people can buy to only be used for specific products or product category. Is this possible and if yes, where do I go to do this?

Thanks.