Auto Create Purchase Order from AIF submitted Sales Order

Hello,

I'm trying to figure out where we actually create the sales order via AIF (AxdSalesOrder, Ax*, Axd* classes).  I'd like to add some after the Sales Order is created to kick off the creation of a custom purchase order.  I have the code to create the custom purchase order working as I expect, I'm just having some trouble locating the best spot to add this code.

thank you.

Cheers,

Bob