If a party is too large for one table, first seat the entire party to a select table. Then, to link another table to this one, press and hold the table to be linked with the sat table and wait for a white dot with the table icon to appear. Then, Drag the white dot to the table with the party sat and release. The two tables are now linked with a small chain link icon displayed on them.
Tapping either table once, the tables can be cleared by using the red icon with the broom. To clear each table individually, tap the table to be cleared twice and select the "Clear Table" button in the bottom left corner.
Note: A linked table will have two red buttons: Clear All Tables or Clear Table, while an unlinked table will just have a Clear Table button.