Click Manufacturing System Gantt 
in the System Tools toolbar.
Select the root system in the tree.
The Manufacturing System Gantt appears showing all systems and operations. The operations are not sequenced at this stage.
In the graphic part of the Gantt chart, drag and drop an operation to a second operation in the Gantt chart.
A precedence constraint link appears between the two operations. The two operations are sequenced.
In the same way, sequence the other operations in the Gantt chart.
Make sure that the figure in the Utilization column is acceptable with respect to the pre-defined Utilization criteria (for example, a figure greater than 95% may be unacceptable).
Note:
If the Utilization figure is excessive, you can move operations from the overloaded system to one that is less loaded or decrease the duration of one or more operations.