You cannot select multiple items in a dropdown. However, you could use yet another content control to display items previously selected. See attached. Note that the 'Selections' content control lists the previously-selected items in the order in which they were selected, not in the order they appear in the 'Progression Steps' content control. Accordingly, you'll need to select the items in the reverse of the order in which you want them listed - or you could relocate the 'Selections' content control above the 'Progression Steps' content control.

Attached Files

My Planning Tool 3 Cascade.docm (43.8 KB, 176 views)

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]