Parameters
- partIndex
- The index of the part into which the segment will inserted. Must be less than PartCount. Specify -1 or (PartCount - 1) to remove the last part.
- beforeSegmentIndex
- The index before which the segment will be inserted. Must be less than or equal to SegmentCount(partIndex). The segment to insert. part at the end of the Parts list.
- segment
- The segment to insert.