Sub Items - more than one sub item column per board/group

Hi, it would be very handy if there could be more than one sub item column per group/board.
For example, i have a board when i log all our service agents. I need a sub items column where i can add training details for each agent and one sub item column for the insurance details for the same agent.

@ll2016,

I’m very surprised that this is not getting more attention!

This would be awesome!