BPC 10.0 NW Business Rules for different periods

Dear Experts,

I have a question, how to customize in BPC 10.0 NW Business process rules for different periods.

I would like to have one rule for the months consolidation and one rule for the year end.

How can I say BPC to take the different rules for different period consolidation, is there anywhere a time which I can link to the rule?

Thanks for you help

Daniel