AME: AP Invoice Approval - Using Different voting methods on action types

Hi,

I have a situation where if the invoice is under a certain amount - first responder wins in acceptable (between approvers A and , but for higher value invoices, both need to approve (can be done in parallel).

My understanding is that the action type: Approval-group chain of authority can only have one ordering mode and voting method.

So I gather I need to use a post-chain-of-authority action type. BUT when I go to associate the action type with the action (approval group), the update and delete buttons are greyed out. Both are associated

with   Approval-group chain of authority which is not what I want.