Matrix Conditional Formatting Rules to include other field values as criteria

I really like the conditional formatting rules, however I would like to also be able to conditionally format a said value in a different colour / range dependent upon other fields values. eg A sale Margin of 30% on Product A may be green but on Product B (a much more profitable item) a green may not kick in until 45%, so when I've applied a filter to look at my matrix for only Product Bs and not Product As, I am needing a different rule to be applied to the conditional formatting colours etc.