User Manager…User Properties

The button labled “Logon To” gives you only 8 computers you can allow the user to “Logon To”.

Is there a way, in NT Server, to increase this number to something more reasonable (higher) say…30-40 wrkstns (for a lab situation)?

I have found no way to increase this myself. I am wondering though is there a text file, etc. that can be edited to make this possible.