Hey...I've made listboxes in the past where the single selection feature works in that the cell reference changes numbers based on the single selection of the list box. However, I would like to "upgrade" my listbox now so that multiple items in the listbox can be selected at once and there is a cell reference that changes numbers for each item in the list box.

I'm not versed on visual basic at all, so the simplest explanation you could offer would be much appreciated.
Thanks for your help in advance.
listbox.xlsx