Repeat date same as the repeating row above

I created a Travel Expense Report.

The user enters receipt information on each row.

They click a button to add another row and another receipt.

The first cell (Column A Row 1) is a auto-generated row number (1,2,3, etc...) based on the instanceManager count.

I would like to make this numbered cell a button that the user can click to add the same date they entered in the row above.

I know how to number it by using the caption, but cannot figure out how to do the rest of the script.