How to set a user name to a be used and always occupied by 1 user count from the license?

Hi, 

Is it possible to set or default the Lanpak user to the named user and make it always occupied or reduce the free seats of concurrent user count to login system? 

For example, I have 10 concurrent users license, but the actual named-users is about 15. Can Sage 300 only release 8 users to be used by that 15 users, and the remaining 2 users to be set used by a fix user name and always be used by the fix user names? 

Thank you.