I was tried to add Product rules but didn't worked. This is what I tried to do.
Ex: I have 4 products named A,B,C,D. I want to give 50% discount for B product if someone buy more than 2 qty of B product.
How can I achieve this ?
You can achieve this by adding Customer Group price for your particular products.
Example: Edit product B => Advanced Pricing => Customer Group Price => Add. Provide the website as All websites and Customer Group as ALL GROUPS. You can select these values as per your requirement and then, provide quantity as 2 and Price as discount with value 50%.
Clear cache and check your product.