Hi , just wonder if fancy product designer not work with Woocommerce product sales? 

It seems it will not add the design price when product is on sales. 

any one can tell me any discount plug in will work

hope it has update with work with woocommerce producet sales. 

it will sale better if work with sth like YayPricing Lite  or just normal product sales

It would be better if you submit a feature request for that specific thing:

https://support.fancyproductdesigner.com/support/discussions/forums/5000217737