Multi-DropDown DataValidation

When your friend Dan Sharpe has an idea, you take some notes!

Definitely a challenge to build this into a tool, and pretty popular on the webstore.

If you are having trouble installing this add-on, you need to make sure that you let it install completely! I get lots of messages about how it doesn't work or won't load. Wrong! You just need to let the add-on install completely.