Footer menu builder – is there a way to have one menu over three columns?

I’m trying and failing to edit the footer menu the way I want it to display.
Am using Amsonia as the base, but where it has five columns, I want to convert three of the five columns to display one menu, with each column having seven menu items.
However, TagDiv Composer doesn’t seem to offer this as a possibility. Is there a way to do this?

Thanks for replying Bettina,
I will create three menus then, one for each column 🙂