Usage:
   ObjectTemplate.SecondSpawnGroupId number

Argument values:

Used in object types (and how often in each type): ControlPoint (1%)

Used in a total of 2 .con files: Controlpointtemplates.con

Parent directory of these .con files: Bf1942/Levels

Example: (from Bf1942/Levels/Battle_of_Britain/Conquest/ControlPointTemplates.con)
   rem -----------------------------------------
   rem --- Axis_East_Airfield ---
   rem -----------------------------------------
   ObjectTemplate.Create ControlPoint Axis_East_Airfield
   ObjectTemplate.NetworkableInfo ControlPointInfo
   ObjectTemplate.SetControlPointName Axis_Airfield
   ObjectTemplate.Radius 50
   ObjectTemplate.Team 1
   ObjectTemplate.SpawnGroupId 1
   ObjectTemplate.SecondSpawnGroupId 2
   ObjectTemplate.ObjectSpawnerId 1
   ObjectTemplate.AreaValue 50
   ObjectTemplate.TimeToGetControl 9999
   ObjectTemplate.TimeToLoseControl 9999
   ObjectTemplate.DisableIfEnemyInsideRadius 0
   ObjectTemplate.DisableWhenLosingControl 0
   ObjectTemplate.LoseControlWhenEnemyClose 0
   ObjectTemplate.LoseControlWhenNotClose 0
   ObjectTemplate.UnableToChangeTeam 1
   ObjectTemplate.Geometry flagbase_m1
   ObjectTemplate.HasCollisionPhysics 1
   ObjectTemplate.AddTemplate AnimatedFlag
   ObjectTemplate.SetPosition 0.000000/8.200000/0.000000
   ObjectTemplate.SetTeamGeometry 1 flagge_m1
   ObjectTemplate.SetTeamGeometry 2 flaguk_m1