classification based expressions in Options&Variants

Hello from my understanding in Options & Variants you can define expressions which are based on options e.g. color=red, blue is the option and choices color = read AND ... is the expression..... Now I am looking for the possibility to refer in an expression to an attribute from the part object and to refer the attribute of the classification of a part. Is this feasible? Any ideas about solutions, workarounds ...? Thanks in advance