package Pricing rule for woocommerce

Hello,

I want to add pricing deals rule like Get 3 products for $20 for specific category(say abc). For this i follow the steps present in link. It shows amount $20 at checkout page for abc category. But it only shows price $20 if i add 3 different product of abc category and not for same products . I also want price $20 for same products too. Please tell me how do i add rule for this?

Also tell me rule for Get 3 products for $20 with 50% off for shipping.

https://www.ads-software.com/plugins/pricing-deals-for-woocommerce/