After you add the target computer's identification code to the computer list, you export the license from the source computer.
When you move a product license from one computer and plan to add it to another computer, you are exporting that license. A license is exported when the Portable License utility converts an active product license into a portable format (either transfer file or transfer code) that can be moved to the target computer.
The Export License dialog box displays the Autodesk product name and license name, and lists the computer name and identification code of all computers in the computer list.
The identification code displayed here must match the code on the target computer exactly.