I am afraid there is no good out of the box solution within FNMS.
You could theoretically automate the linking of entitlements to multiple licenses. But even then this automation would need input, which might be subject to change. I am also not if the benefit would justify the effort.
I ran into the solution by accident. When creating the licenses I linked the second one to the same purchase as the first and found the "License entitlements" field in License properties, Purchases tab.
Lo and behold, in the help text:
- For the purchase you wish to split across licenses, select the value shown in the License entitlements column.
- Type a new value. Take care not to enter a figure greater than shown in the Purchased column for the current purchase record.
- Click Save to store your changes in the database."
Perhaps I didn't explain my issue well enough. Anyway, thank you for your responses!