Populating 1 listbox from another listbox

I have 2 list boxes on my form. I am trying to populate listbox B
with the selection from listbox A. I have set multi-select in both
boxes to Extended...

The user will select the items from listbox A and click an Add button
that will then copy the items to listbox B. Then for each item in B,
I need to add them to a database. If there are 3 items in listbox B,
I need to add 3 line items to table B...

Any ideas?
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