Hi Traci,
My favorite way to do this is to drag the original attribute all the way to the left so that things are grouped by those categories. Then edit the “none” cell to say “none to little” and, likewise, edit the “little” cell to say the same thing.
They won’t instantly combine (too bad), but if you drag the attribute back to the right and then back to the left, you’ll see that they have been combined.
Hope that helps,
Bill