Hi Christoph,
Can you elaborate your request a little bit more? Please provide more details (your code, samples, examples, etc) so we can try to help further.
I'm assuming you have an information model (analytic/calc view) with 3 output columns and the variable will be used to filter 2 of the output columns. Did I get this right?
What exaclty are you looking for in terms of filtering?
Regards,
Lucas de Oliveira