Discount category except products A and B

Get all products from category „Beer“ discounted 30% except products "7281102050K_M0001" and "7281103033K_M0001"

Create new discount rule, fill fields in „Discount info“ and save.

Select discount type „Assigned to categories“.

Add category to panel „Applied to categories“, to which products discount must be applied.

In this case: "Beer".

Add in „Requirements“ panel new „Include / exclude products by sku“ requirement.

In section „Selected Products“ select Product Action Type „Exclude“ 

and select products, which are excluded.

In this case: products 7281102050K_M0001 and 7281103033K_M0001.

Save requirement section changes.

Leave other requirement sections empty.

Save discount rule.