Different scheduling type in Plan order

Hi All

I want to use multiple schedule type in Plan order. Actually I have maintain backward scheduling in OPU5.  when start date goes in past system automatically moves to forward scheduling. It is fine.But in some of my cases sub assemblies or Raw material is delay. In that case I want reschedule final assembly's start date. but system is not allow to put as start date in backward scheduling.

Is there any option/setting to select scheduling type in plan order on user requirement?

Regards

Sandeep