Change Agent in Production system

Dear experts,

I want to do the following things:

Developed a custom workflow for PO Approval, agent is fetched from Rule using Agent Determintaion:Responsibilities, now i want to change agent only in production system, is it possible?

Example:

If PO is created with amount 10,000 user ABC will approve, if amount is Gretaer than 30,000 user XYZ will approve, now i want to change agent DEF instead of XYZ only in production system, please help.

regards

goudham