Thank you John, thank you Mel.

I can't put color in the kanbans, what do you call the header ?

I think I found the way to do it

 E.g.: grouping the bird base by feeding

 First, the food field must have been created with a combox radio list using a formula.

 Then just put this menu at the very top of the left column of the window opened by the gear icon in Kanban and select "group".

The power supply types will appear at the top of the cards and the cards will have different colors depending on them.

Is that right ?