Can one integrator have two or more interfaces?

This is related to the quest to have coordinated data loads, where the user creates one spreadsheet and it uploads two or more types of data.  A new vendor, site, and their first PO, for example.  An AP and AR invoice could be another, if auto-offset isn't feasible for you.  And so on.

Can you create one integrator that accepts all the fields, then have two interfaces, each using a subset of the fields?  So for example, the layout would contain vendor name, vendor site address, vendor site city, vendor site state/province, vendor site country, item number for the PO, quantity for the PO, price for the PO, destination organization for the PO.  One interface would pick up the vendor information and create the vendor, the next would create the site, and the third would create the PO.