Can we reserve item for specific customer?

Hi,

We have requirement -

Like o reserve the item for specific customer/s

The process is, we are manufacturing company, we also sell Raw Material,

Customer orders for FG which will be assembled using Raw material, this process take some time for Engineering and Production etc, mean while we do not want raw material required to be sold to other customer and reserve it for this specific customer.

Is there any functionality available for this process ?

Creating Discrete Job , & Material requirement process falls in Production step, we need some thing prior to it.

Please suggest.

Regards

Sanjiv