Yes, you add the additional cartridges with licensing, and ready to start deploying.  Depending on the size of your environment, might want to be careful as to scalability of your current hardware, etc.
We've been using Foglight and the JavaEE cartridges for years and are now looking to extend our use of Foglight to include vFoglight and Database cartridges as well. I was looking around for information on how to integrate our existing Foglight Management Server with new vFoglight monitoring, since it appears to be a separate FMS type console.  I ran across this old thread: [URL]#10367  Is it really as simple as updating the license file to get the vFoglight capabilities into our existing FMS?
Possible to integrate existing Foglight environment with new vFoglight purchase?