Mike,
If you are not already on the latest version of GSS / boot disc creator then I would update to Ghost Solution Suite 3.2 RU4 or Ghost Standard Tools 3.2 RU4 before proceeding.
You can manually upload the driver into the file folders...
GSS
C:\ Program Files (x86)\Altiris\eXpress\Deployment Server\Bootwiz\platforms\Winpe10\x64\Drivers\Custom\drivers\ ADD YOUR DRIVER FOLDER HERE
GST
C:\Program Files (x86)\Symantec\Ghost\bootwiz\Platforms\Winpe10\x64\Drivers\CUSTOM\Drivers\ ADD YOUR DRIVER FOLDER HERE