I apologize if this has been asked before but I couldn't find it anywhere.

I have some items free shipping and some not. Is there some way to tell ZC that if one item is free shipping, the whole order is free shipping?

For example, I might have a $150 item that I offer free shipping. If a customer adds a $10 widget to the order, they're charged shipping on the widget. I'd like to make that whole order free shipping and I can't do it with the order total option because I also have some $150 items that aren't free shipping.