Licensing for QMM is not cumulative.
Only one license can be applied at a time.
For example if original license was for 5000 objects and then another 1000 had to be purchased the resulting license file needs to reflect 6000 objects total.
When requesting an additional license from a Quest representative, please explain that you already have an existing license count and would like to add more.
You can open a Licensing Service Request (as opposed to a Support Service Request) at the Support Portal located at https://support.quest.com/ and a Licensing Team representative will be able to assist you.