I have a CR 10, where there is a list of class names, group by type. I also include a field of record number (using special field: record number). However, I want the record number start at 1 for each type group for example:

Group: Math
1. Algebra
2. Statistic
3. Calculus

Group: Chemistry
1. Organic
2. Analytical
3. Inorganic

and so on.

The special field: record number, does not want to do that, it continues on the number through all the groups. Can anyone help me, please?