Echoing the others, it's not clear exactly what you want to do.
Correct me if any of this is incorrect:
Are you trying to combine CMOD instances or just upgrade each on in place?
If you're trying to upgrade each one in place then we have two different scenarios.
(1) CMOD serving up data via "servers" --- which I take it are WebSphere or Apache?
First upgrade your admin client right now to 10.1.0.5
Then ensure your "servers" and ODWEK code is at a mutually compatible level.
Then upgrade the server as per the applicable readme.
(2) CMOD serving up data via the thick client
First upgrade your admin client right now to 10.1.0.5
Ensure your clients are at a mutually compatible level
https://www.ibm.com/support/pages/compatibility-matrix-content-manager-ondemand-clients-and-serversThen upgrade the server as per the applicable readme
Ed