>
>But, How do you define a variable that counts the
>number of distinct values myGroup_id takes at the
>end of the report?
>

MySelf:

There is no way to define such a variable in the report designer!, so i think you must wait until VFP 5.0 is shipped and see if MS have updated the anachronic report designer (and the menu designer as well)and make it a Really powerful tool.

HTH (see i'm using acronyms!)