OME Filter by Generation

Does somebody know an easy way to create a filter by Dell Server Generation?

I see a setting in the Device Configuration Inventory called:
              iDRAC/Rac Information/Info 1 Server Generation = 15G
But I can't find something equal in the filter options.

I know I can set a filter by "Device Model" (R650 or 750 or 350 or ...) but this can cause I miss something.
And only six "or" are allowed.

Regards
Muese