First of all, if you are going to combine license files with other vendor's products, you need to determine if the license files are compatible. The headers of each LIC needs to be identical. They should both begin the same. For example, an Autodesk LIC has the host name and ethernet MAC address like this:
SERVER hostname 00123456789a
USE_SERVER
Then you need to add the additional Autodesk Vendor string under the existing vendor string from the other party.
SERVER hostname 00123456789a
USE_SERVER
VENDOR product port=12345
VENDOR adskflex port=2080
Finally, you need to append the INCREMENT portion of your Autodesk licence beneath your other vendor's feature.
SERVER hostname 00123456789a
USE_SERVER
VENDOR product port=12345
VENDOR adskflex port=2080
INCREMENT vendor product gsi 3.0 1-jan-0 0 1234565F0B29D5F2DD24 \
VENDOR_STRING="VENDOR:other HOSTID:00123456789a" HOSTID=ANY \
NOTICE="Example of other vendor license SN=A12345"
INCREMENT 57600ACD_2009_0F adskflex 1.000 permanent 1 \
VENDOR_STRING=nfr:permanent BORROW=4320 SUPERSEDE DUP_GROUP=UH \
ISSUED=01-JAN-2008 SN=390-12345678 SIGN="0D9E 0D9E 0D9E 0D9E \
09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 \
09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 \
09E1 09E1" SIGN2="09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 \
09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 \
09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1 09E1"
Save it as a *.lic file and make sure that your Service is pointing to this license.
Then make sure that your NLM is up to version 11.4.1, as this is the latest version and is required for Autodesk 2009 products.
Start the license server and do a Status Enquiry. You should see all of your licenses.
*Note: This only works if your license files are compatible. Above information is for information purposes only and does not contain any valid data. Good luck!