The calculation you need is Case ( Number ≥ 6000 and Number ≤ 9990 ; 1 ; "" )
Haveing a flag for each of the boundaries and the a summary for each will give you the result your after.
Hope this helps
Case (Number < 6000 ; 1 ;Number < 9999 ; 2 ;3)
Thank you both for your answers.
The between was the big one, the other was just a confirmation.
I really appreciate your responses.:)