issue with order type and plant

Dear Expert

Is it possible to restrict plant on base of order type. means we know that we can restrict plant on sale area base by removing assignment between thewm. but it is possible on base of order type.

example - i have two order type 1 xx 2 yy

plant is zzzz

sales area is aaaa ,ss,ww

now what actually i want

when user use order type xx then plant zzzz can show him in order with the same sale area which maintain above.

but when user use order type yy then plant zzzz can be show him in order create even still area is same.

I hope it is enough to understand to you my requirement. we know we can stop plant by remove assignment between plant and sales area.

please help me .

THANKS

VISHAL