Quarter/Jahr in Report

Hi experts

by building some reports i get some difficulties.

I wanted to build reports with previous und current quarter.

I could see the previous quarter in teh activated elements. So i take the curent Quarter and i set up an offset with -1 to build a previous quarter.

Ich wanted in each column the appropriate quarter to appear. I try to select a text varaible but didnt succeed.

Can anyone help me to do that?

Thanks

Gilo