Issue with Workflow set up for Purchase Req - Overall release

Hi Xperts

We are using Release procedure with classification for Purchase Requisition.

We have marked the Workflow Indicator against each Release Group/Code combination

Now we need to set up Workflow functionality for the above.We have already assigned relevant Agent-Ids against Rel Group/Code as well.

Could you please advice how can we proceed for setting up workflow for this?

Requirement

1. When PR will be created a workflow will get triggered

2. When PR Valuation Price/Qty will be changed , a new workflow will get triggered

3. System will automatically determine the relevant agent via Release Code

Regards

Soumick