in backend , for Product A we set the price = 100.
We created catalog price rule with 20 % for all products.
the catalog price rule should not apply for full price.
it should apply for ( product price – 3% of product price )
ex : (100 – 3) or 97 % of product price.
Means for only 97, the 20 % discount should apply.
If the product price is 1000, than only for 970 – the catalog price should apply.