I have several site-to-site VPNs from small offices, to the main office.
Is possible to do a single configuration for all the VPNs on the "vpn server"(ISR 1801) or I always need to add a entry for each VPN subnet? If so, is possible with CCP?
You can configure then VPNs using CCP.
I prefer the command line, and if there are many Site-to-Site VPNs, you can have a template, and all that changes from one VPN to another is the interesting traffic, the peer IP and the pre-shared key.
This depends on the policies.