Sorting on a certain field

I am trting to create a report with the following:

-Catalogue nr
-alternative number
-Available stock
-Turnover 2007
-Turnover 2008

This is no problem and I receive a nice report. But we have three different catalogue's, 1,2,3 and I want to sort them so I have an overview per catalogue. I know that for sorting a report I can use the "+ or -" symbols, but in this case I don't know where to place them. I cant place them in the NF-funtion ( in this case the on Catalogue nr ), can I?

I hope someone can show me what I am doing wrong. I have uploaded my file so you can see for your self.


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