strategic planning workspace - How to add group by functionality to customized feld

[ShreyasG]

Hi,

I am working on a requirement where I have to provide a functionality to newly created field in Prioritization/scoring section. Currently all other fields have this functionality I have added my field in portfolio plan configurations as well and still I am not able to see group by option on my field. 

Other custom field with this option:

Please let me know if I am missing anything

Thanks,

Shreyas

[PaulaaO]

Hi Shreyas - what's the field type in each case? Are they the same?