sales order query

Hi ,

I have one scenerio(MTS) in which a production order is released for one sub assembly say XYZ (qty-9 nos) .

Now during production, if a sales order has come for sub assembly XYZ( qty-1 number)which is urgent and need to be delivered..If this 1 number is picked and delivered to the customer from the 9 numbers which were in production . My query is how to link this sales order in the above case. Also should i need to run the MRP once more for 9 items. Customer wants to keep a track of this type of production orders( where quantities are changed due to product diverted to another sales order), and also system should alert this type of uncompleted orders.

Any help in this regard.