Use Approvals Management (AME) for Purchase Order (PO) for Purchase Order Review, Approval, and Mult

To enable this functionality there is direction to setup a style with settings for Approval Workflow, Workflow Startup Process and AME transaction type.  Does this change affect all purchasing documents or is it possible to leave the standard associated  with the SPO document type and create a style for as an example a Goods SPO style associated with the SPO document type?  Can you revert back if testing does not produce the results as expected with only blanking out the configuration changes?

Thanks