In Boneyard, there is a left attacking team, and middle team, and a right team. These are called fireteams, and you can also respawn on the other member of your fireteam.
For initial spawns use 8 regular initial spawns for each team, even if you only plan to have 6 on each team.
Label: red, 0, invasion spawn
Red spawns phase 1:
Red respawn zone~ first fireteam (left for agruements sake): red, 0, invasion spawn p1
Red respawn zone~ second fireteam (middle team): red, 1, invasion spawn p1
Red respawn zone~ third fireteam (right team): red 2, invasion spawn p1
Red respawn zone~ for entire team : red, 3, invasion spawn p1 (only phase 1)
Repeat for phases 2 and 3,(change final part to invasion spawn p2(3)) even if it is the same place, you need 2 spawn zones,other wise the whole team will be able to spawn there.
To have a team spawn (ie vehicle bay) starting in phase 2 and useable in phase 3 use this:
Respawn zone: red 2, invasion spawn
Any questions?