Karen,
With WCCP, you can have multiple WAEs (theoretically up to 32) and multiple routers (again up to 32) in the service group. So in your case, both routers can be registered to the same WAE(s). You can limit traffic via a redirect-list, which is an ACL (only accept traffic to/from your remote site).
WCCP is configured on the interfaces for the service groups you are interested in. For WAAS, you use services 61 and 62 in opposite directions to perform load balancing appropriately.
A hint on your wccp on the 6500. Always configure redirect-in on the interfaces, L2-redirect and mask-assign to keep the traffic processed in hardware.
Here is a link on configuring WCCP for WAAS (which I assume you are deploying).
Hope that helps,
Dan