Multilevel Approver

Hi Experts,

i have created a customized workflow , in which getting problem in agent determination.

i have to define agent in way that for a one condition , mail goes to all levels , for other condition mail goes to

3 different levels , similarly 2 and 1 based on condition .

How to create a rule (can we derive multilevel approver from PFAC) and how to use that in workflow ,(in loop or directly,

as number of approver is dynamic ,that we have to determine in rule i think )

as if all the level person derived approve it, then only it should implement otherwise not .

Regards,

Sonu