how to join license files ?

Hi all,

I have a rather dumb question... how can i integrate many license files into one so that I can pool all the licenses into 1 server. I have arcgis desktop 10.1 with various levels, Basic, Standard and Advanced. And I want to integrate the ECP files into 1 file so that i can put it in one server.
If this is possible, how can i do it ?

thanks