is anyone aware of any intercompany net settlement app or something in Netsuite that would can be used to establish the net position between two ico subs? and also something that would match bills to invoices leaving the net position open to pay?

@NetCase Are you aware of the interco features NS has, such as Intercompany Journal Entries, and the Intercompany Framework (the one that allows you to synch interco SOs and POs)?

yes, that would be something that happens first, so ICO journals/PO then use the NS interco SO creation and from then create bills and invoices but then it is the settlement of those invoices on the net basis that I can't see it's possible in NS.

You have to pay both transactions separately. NS has no "netting" functionality, whether for interco or for vendor/customer arrangements.