Postponing Dates in the Schedule Lines 
Procedure
Select a number of months by which the dates are to be displaced.
- Select one or more schedule lines.
- Select Edit → Chge sched.line.
The Change Schedule Lines dialog box appears.
- To change the quantities, enter the quantity by which the schedule lines are to be changed, and select the arithmetic operation.
- To displace the date, enter the appropriate number of months in the Postpone by __ month(s) field.