Rescheduling of Production Orders using COHV

Hi,

My Client Requirement is:-

There are more production orders . I have to reschedule that production order one after the other.

When I change 1st production order by 2 days in future then all the production orders are reschedule after 1st production order.

Eg. Reschedule 1st Production order date is 20.01.2012 , then all remaining production order reschedule after the 1st production date 20.01.2012.

I have tried in Mass processing of production order COHV but couldn't give result.

Please tell me the Procedure for doing it with brief.