Adding Panels without moving from NEM2.0 to NEM3.0

I am looking to upgrade my home solar with a ground mount array, 2 wallmount batteries, a FlexBoss and GridBoss.  Right now my house is on NEM2.0 and the solar inverter is hooked up to my main panel.  I am looking to hook up my current inverter to a smart port on the gridboss, and hook the new array and panels up to the flexboss and hook that up to the gridboss inverter port.  Is there a way I can set up the gridboss so that it doesn't do an export any power from my flexboss?  Or is there a way to limit how much power is exported so that when I file for my permit I can say my new system is non-export?  I can keep my NEM2.0 if my new addition is non-export, but will be moved to NEM3.0 if it exports...