This is perfectly possible and as designed.
Assuming variables var1 - var6 in the utag.link call then in your google Analytics tag:
Make sure var1 - var6 are defined in the Data Layer tab as type UDO Variable
1. Open the mapping toolbox by clicking the edit button from the mapped data sources section
2. From the mapping toolbox, select var1 from data source drop down and then click select destination. Find event category on the event tab and click ok.
3. Repeat for remaining variables, mapping to your desired destination.