How to Configure WebCenter Portal1 server to WebCenter Content1 and WebCenter Portal2 to WebCenter C

We have 2 node Cluster environment for WebCenter Portal and WebCenter Content.

Currently if you go to EM and Spaces1 and settings and service configuration

Under Content Repository if you setup Content server1 for spaces1 server

Do same thing for spaces2 server i.e. setup Content Server2

If you go back to spaces1 server and under Content Repository you will see Content server2 setting.

Looks like you can have only one content server associated with both spaces server.

We want to set up our spaces1 should have content server1 and

spaces2 should connect to content server2.

Any help here will be appreciated.