How To Group Multiple Tables On One Sheet

I have two tables on one sheet in Numbers. They are stacked vertically. The top table grows downward as I enter more rows. At some point the top table starts to overlay the bottom table. Is there a way to group the tables together, so as I add rows to the top table, the bottom table automatically moves down? I would then not have to select the bottom table and move it manually. Thanks
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Thayne