Take a look at the example seating chart below:

Notice that every row has 25 seats and there are 6 rows in every section. Since every section is so similar it is much more convenient to create just one section and clone it 5 times:

So first use the "bulk load" tool to create the first section. After doing so your page will look like this:

On the bottom of the page find the "clone" function. From the drop down list select a section to copy all of these seats to:

After the cloning process is complete, you will be redirected to the other section's detail page. Now you can confirm all the seat were saved correctly. You can also make a changes too, such as deleting extra seats: