GRR2 subgroup of a group

Hi,

I am trying to build a sub-element within an elment in a report. I would like to create a elemnt called "cost of hours" which can be expanded in other sub-elements; "Operations", "Develpment" and so on. Anyone kind to assist me with that?

Now I only have a list which is taken from a set of account, but I would like to have the set of accounts catogorized as sub-elements of the main element "Cost of Hours".

thank you

Regards,

S.