Defining the Planning Segment 
Prerequisites
You must create a line hierarchy and insert a sort buffer between the line segments.
Procedure
Starting from the planning table choose Sequencing
®
Select line segments.The system displays the graphic display of the line hierarchy.
To reset the current planning segment, select it and choose Edit ® Planning segment
® Deselect.
Click on the new line segment to be defined as the planning segment and choose Edit ®
Planning segment ® Define.
Choose Back.
Result
The system uses the line segment you defined as the planning segment for scheduling in the sequence schedule.