AR Refund Approval Workflow

Hi,

Is there any document replicating the steps for setting up approval workflow for the refund process? If not, can you please let me know the following:

1. Is there a delivered SQL Object Identifier for setting up user list definition? I prefer to use SQL Definition as user list source

2. What is the Amount Field to be entered in the Field Criteria and  Monetary Criteria grids in Setup Process Definition for the refund?

Any assistance would be much appreciated.

Thank you,

Armand