I have a form that displays Contacts, and I want the user to be able to select whatever Department(s) the contact works in. On the Contact form, I have a listbox that lists all Departments available (from a Table named Departments). The Departments all appear, and I can select multiple Departments no problem by holding the Shift key and clicking on all that I want to select. They assign the correct values to the Department field in the table.
BUT, I would like to offer the user a checkbox in front of each department that s/he can click instead of the method I described above. I have another form in the same database (named Companies) and the checkboxes appear fine for all "Industries" that may apply. I have compared the two forms to try and see why one offers the checkboxes and the other doesn't, but I can't find out what the difference is.
What settings on my Contacts form should I set so that the user can use a checkbox to select multiple vales instead of using Shift+Click ?