variable for grouping in rtf template

Summary

group data accordingly to variable value defined by user

Content

Hello,

I have an rtf template(attach) and i would like a dynamic way of grouping it´s data(attach).

If i give user a single choice dropdown to select the grouping i need the rtf template to be able to assign the variable to the <?for-each-group?>.

Is it possible?

Regards

Carlos