Tip!
There are different ways to associate the services being added.
1) Proposal- add the service to the entire proposal. (This will affect all the options on the proposal)
2) Proposal Flight Group- add the service to an entire flight option. (For example, if you have multiple options, and you want to associate the service to only one option)
3) Proposal Flight- add the service to a specific flight on the proposal. (Meaning to a singular flight segment)