The Order Manager tool has been configured in order to be part of a Eye care workflow. That means that you are now allowed to select the Eye care domain (drop-down box at bottom-right of the home page). In this configuration, the simulated actors (Order Filler, Order Placer and Image/Report Manager) will use the codes defined for the Eye care domain.
Ordering codes are available there in a SVS format: http://gazelle.ihe.net/RetrieveValueSet?id=18.104.22.168.4.1.12522.214.171.124.26
The Order hierarchy used to schedule procedures for a given ordering code is available there: http://gazelle.ihe.net/examples/orderHierarchy-EYE2012.xml