Prior to ITMS version 8.1, licenses were provided in a text format that often required combining for situations when you purchased additional licenses. Starting with version 8.1, licenses are in an SLF format and no longer require combining. Simply apply the additional licenses with the Symantec Installation Manager (SIM) and they will be added to your existing licenses.
For customers on versions 7.5, 7.6, or 8.0, the legacy text licenses are still needed. To obtain legacy licenses, please contact your sales representative or Symantec Customer Care to request that the licenses be generated for you. As part of the legacy license request, Symantec would like to confirm that you are aware of the EOL policy surrounding older products and ensure you have the resources you need to upgrade to the latest supported version.