Workflow or AME for iexpense approval

Hi,

We are on 12.2.5 and implementing iExpense. Is there a way we can eliminate cost center criteria during approval process. We would like to use standard HR supervisor approval process but need system to ignore signing limit by cost center instead find immediate HR supervisor and find if supervisor has limit.  Signing limits are to be maintained by OU ,Cost Center & Supervisor and too much to maintain various combinations with 7 OU's and resources spanning in different cost center and supervisor in another. I see oracle provided API to load signing limits but instead was seeing if we can