After the overall Seating Section has been created
Right click on the seating section object
Choose edit boundary, this will take you to the basic polygon that defines your seating section
Draw the polygon that defines your rows, oversized aisle, etc
Select both polygons and use the Clip Surface command
If you don't clip all the way across the Seating section and simply take a bite out of it
The Seating Section will remain connected and will display the row with seats on both sides