Diffrent b/w Catalogue and Non Catalogue Items ??

Hi ALL,

Hope you all Ok. I know the basic diffrence b/w Catalogue and Non Catalogue Items as Catalogue's are those which have the On Hand Quanity with ourself and Non Catalogue is one that we purhcase from outside. We also know that Both Catalogue and Non Catalogue can we Inventoy and Expense too.

Now What I am wanted to know is to have a provision on the basis of which we gives the Diffrence b/w two and how does we call the Non Catalogue Item into the Requisition when it is not define in the back hand (Master Item).