All Opeartion Start date Schduled at Prod. Order Start Date

Greeting..

I have a material whihc is having 5 opeartion. Now in scheduling system first schedule first opeartion n calculate start & end date of first opeartion.

Now for second opeartion .......end date of fisrt opertion is the start date of second opeartion and by ading satndaed time finish date of second opearation..and so on..

Now how to set the common date as production order start date for all opeartion So the each opeartion will start on Produciton order start date.

Please give ur input