Discount by group of customers and by category of products

[Mikado]

For a given group, I shall wish to apply a discount the rate of which would be variable according to the category of products.

Example:

1. For the group pricing I
- 20 % on all the products of the category A
- 30 % on all the products of the category B

2. For the group pricing II
- 10 % on all the products of the category A
- 15 % on all the products of the category B

Is it possible?