Horses are identified by saddlecloth number, not by name.
Clients are responsible for correctly selecting both horse and race numbers on all wagers.
When you wager on a horse that is coupled, your wager includes all horses running under said number. If a horse is coupled with others, and you bet on any of them, you receive all horses running as part of the entry.
If part of an entry is scratched and part of an entry runs, all wagers have action. There is no "must go" action as part of the entry. If one of the entry horses runs, all wagers and bet types have action.
Galaxy does not accept wagers such as "Turf Only", "Main Track Only" or any other conditional wagers.