Dear Sharad,
First of all I recommend to open a new discussion and not to post in a old-date one.
Anyway, You can do it either PA40 or OOPME.
In PA40 you should select an appropriate action like :Org. Change", "Promotion" and so on. In fact it depends what do you have in you action list.
In PPOME you can do it by drag and drop also. Just take care about effective date. First you should select the right date in top of the screen.
Regards,
Omid