G Lakshmipathi,
For that first you have to list out what are the item categories that are not relevant for pricing. Then you dont assign those item categories to your sales document type in VOV4.
I think you design does not address the requirement -
1. How do you link the materials (for which sales orders should not be created) to item category(ies)?
2. Because of point 1, when you don't assign some item categories in VOV4, it might not allow creation of sales orders for materials; for which order creation should be allowed.
That is the reason I have suggested to use Item category group. This field value can be inputted in the select materials and via VOV4 and item cat gr. this requirement can be achieved.
It would be interesting to hear your comments.