There is an Out of the Box SP ListBox that allows the user to select options and display them on another ListBox?
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10-12-2019 - |
Solution
There is a control called the GroupedItemPicker that is used on the "Add Columns from Site Columns" page (and I'm sure other places)
OTHER TIPS
If the column is configured for choice : multiple values allowed
List settings --> choice column --> allow multiple values
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