Revit OneBox, what is that?
Revit One Box is an "all in one Revit" it has all 3 disciplines commands in it. Revit Architecture, Revit Structure and Revit MEP all in one install. This program is ONLY available with the Building Design Suite Premium (BDS Prem) and Building Design Suite Ultimate (BDS Ultimate) installs or if you download the Trial version of Revit.
So, if you must use all the commands available with the Revit One Box, then yes, install it. Again, you must install from the BDS Prem or BDS Ultimate media or the Trial download (using your serial number and product key from your BDS Prem/Ultimate box).
If it's a standalone license serial number then yes, install it.
However, if you have a network license serial number for the BDS Prem or Ultimate and you have multiple Revit license types in your license file, then you may want to think about this. No matter which tools in the Revit One Box you use, it will consume a BDS Prem or Ultimate license. It is unable to cascade down to the cheaper Revit licenses (Revit Architecture or Revit Structure Suite to name 2 types).
If a particular machine only needs the Revit Architecture commands then install Revit Architecture on the machine. Revit Architecture will first try for the cheapest license (Revit Architecture) then cascade up to Revit Architecture Suite licenses then to the Building Design Suite license. The same type of cascading is true with the Revit MEP and Revit Structure (see the cascading document: http://usa.autodesk.com/getdoc/id=TS18708338 )
Autodesk Support has posted more on this on their Up and Ready blog, you can see it at:
Do you need a special version of flexlm for Revit one box? Yes. You will need to upgrade to the 2013 flexlm version 11.10. See our blog at: http://blogs.rand.com/support/2012/04/the-2013-network-license-manager-has-arrived.html
Stay tuned for more information as we learn more about this new program.