I have two fields on a form. Category and Sub Category. Category is a drop-down list box and Sub Category is a multiple-selection list box that is filtered by the Category drop-down.
Everything is working (mostly). The problem I'm having is that if I make a Category selection then make a couple of Sub Category choices and then change my mind to a different Category, the previous Sub Category selections are still shown in the list by their lookup IDs.
I was thinking I could somehow put a rule on the Category field so that it resets or clears the Sub Category field whenever the Category field is changed. I know I can set a field's value but I can't figure out how to clear the Sub Category multiple-selection choices. Thank you for your help!