Hi Surendra,
You can use following path of configuration or user traction /DBM/ITEM_COPY.
DBM SPRO--> Order->Copying of items->Determination of item category->Define criteria.
Here you can maintain source to target item category copy control at various levels of criteria tables.
Alternatively, you can restrict copy of items at following configuration path:
DBM SPRO--> Order->Copying of orders->Define Copying Control for Order Type
choose your copy combination & uncheck copy items.
I hope this helps
Regards,
Sachin Balmiki