Approval Set Up For Internet Expenses

Hi,

I am setting up approval for oracle internet expenses in R12. But I need to configure it as follows. Lets say we have persons A,B,C,X and Y.

Persons A,B & C belongs to one group where last approver is person C & he must be able to self approve too. In this group if person A submits an expense report it must go to person B,then person C. If person B submits an expense report it must go to C. C must be able to self approve his expense reports.

Persons X & Y belong to another group where person Y is the lastapprover. If person X submits an expense report it must go to Y. Y must also be bale to self approve his expense reports.