Needs to Maintain budget with Plant level

Hi,

I have one business scenarios like in one company code we have two plants,  plant A and Plant B.  When i am procuring material M with plant A, My budget is for usd 1000.  When i am procuring material M for plant B my budget is usd 500.

How can i maintain budget control in Funds Management for above scenario.

Kindly guide me.

Thanks and Regards,

Krishna