Regarding Automatic Sales order item category determination

Hi experts,

I have a doubt regarding the automatic sales order item category determination.

My Scenario is like this: I am having 1 co code, 1 sales area, 1 material (fert type), 2 plants.

plant 1 item category group is given as NORM ( standard item) and in plant 2 same material's item category group is given as BANS (3rd party). i have done the req things in VOV4 - item catg assignments for both the plants accordingly.

My Requirment is that when i am creating a normal sales order (OR) using plant 1 sales item catg should automatically be determined as TAN( std) and when i am creating SO using plant 2 sales item catg should automatically be determined as TAS( 3rd party).

I know something like this can be done using 2 sales organisations but can i achieve the desired results using only 1 sales org? Is it possible in standard SAP system?

Thanks in advance.

Regards,

Kant