What version of VC are you running? Latest patch?
If so, you can just put them all into the License folder and the Flex service will read them all in properly.
Or, if you want (need) to combine them, you can take one license file and append everything from below the server config portion, (below "USE_SERVER"), of the remaining files to the first.
Format would be something like:
SERVER this_host ANY 27000
VENDOR VMWARELM port=27010
USE_SERVER
#license 1
INCREMENT PROD_ESX_FULL VMWARELM ....
INCREMENT ESX_FULL_BACKUP ....
INCREMENT VC_ESXHOST VMWARELM ....
#license 2
INCREMENT PROD_ESX_FULL VMWARELM ....
INCREMENT ESX_FULL_BACKUP ....
INCREMENT VC_ESXHOST VMWARELM ....
etc.
