This attribute specifies the hold frame used in defining a Hold segment.
Astrogator <Satellite Object Path> SetValue <Attribute Path>.HoldFrame {Value}
The value is the reference frame of the Hold segment. The default coordinate system of a Hold segment is Earth Inertial.
You can use any coordinate system that is defined in the Vector Geometry Tool of the Select Reference Axes window. Make certain that the name is copied exactly. If you require additional coordinate systems, you can define them using the Vector Geometry Tool.
Astrogator */Satellite/Satellite1 SetValue MainSequence.SegmentList.Hold.HoldFrame "CentralBody/Moon Fixed"
STK Programming Interface 11.0.1