Newbie scheduling questions:
Say I'm scheduled for a block of reserve on Saturday - Monday.
There's a 3-day trip in open time Friday-Sun.

1) Do I submit a GS, or a GSWC, since the trip goes into a period of reserve?
2) If awarded the trip, how do I put in my preference for which day to take off my current reserve schedule?

Thanks in advance from a steam-driven mind in a digital world.