In an Initial State, Follow, or Launch segment, you can use this attribute to define the initial value of user variables that are defined in the Mission Control Sequence (MCS).
Astrogator <Satellite Object Path> SetValue <Astrogator Object Path>.UserVariables.<Variable>.VariableValue <Value> [<Unit>]
Enter a numerical value and unit, if appropriate.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Initial_State.UserVariables.MyVar1.VariableValue 5
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Launch.UserVariables.MyVar1.VariableValue 5
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Follow.UserVariables.MyVar1.VariableValue 5
STK Programming Interface 11.0.1