How to restrict revenue and Billing for Projects

Hi,

I have scenario below:

We are using Work/Work distribution rule for Contract Projects.

1. I have more than 100 projects for one client.

Business users are entering  iexpense expenditures,Payable Supplier invoices and other projects expenditures.

After entered expenditures, business interfacing  all cost to Projects and transferring  to GL.

2.We have one more client and 10 Projects are available.

Same as above 1 scenario users are entering expenditures and interfacing to  Projects and transferring to GL.

For scenario 2 we need to generate Revenue and Billing but we are not generating revenue and billing for scenario 1.

Ex: Rent Expenses are entering in Both scenarios.