Use Case 1

The user wants to send the complementary checking copies for every order to the same address. They do not order more.

Use Case 2

The user placed an order for multiple magazine ad placements, and they want to send the checking copies of different issues to different addresses. They do not order more.

Use Case 3

The user orders more checking copies. They want the same quantity of extras for each order, and ships them all to the same address.

Use Case 4

The user orders more checking copies, but decides to manage the checking copies for each issue separately.