That appears to be a product which is no longer for sale, so it's unlikely that we'll add full integration into VBP for it.
http://en.wikipedia.org/wiki/Cmvc
But if CMVC supports a command-line interface, you could call it from a Run Program action.
http://www.visualbuild.com/Manual/runprogramaction.htm
If it supports a COM automation interface, you could call it from a Run Script action.
http://www.visualbuild.com/Manual/runscript.htm
In either case, you could also wrap it in a custom user action.
http://www.visualbuild.com/Manual/userdefaction.htm