See the attached which should do what you require, however using a repeating section content control to duplicate the table doesn't appear to produce the desired results, so I would suggest using a button either on the document (as in the attached) or on the ribbon to add tables as required.
The process recalculates the totals after each change so the totals should remain valid if the user changes a control.
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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com
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