Using Project Billing

Hi,

We are on 12.1.1

We wanted to user oracle projects for billing our clients.

But there are so many billing models that we currently use. Wanted to get an overview of how the billing module works and how to go about in using this.

I am clear that we need on a high level like create contract projects , create agreements, generate draft invoice, approve, interface to AR and tieback invoices in projects.

We have several billing models, and I am looking for some inputs as to where we can capture that info for project billing to use while creating invoices.