Any way to export/import the valve of a state variable in one eisy to another eisy?

I guess you mean the value of a variable. For that, use REST commands, sent by a network command.

Go down to "variables":

ISY Developers:API:REST Interface - Universal Devices, Inc. Wiki https://share.google/QXVb7N3fCS9GVj5cc

I had an ISY and a polISY running together at one point in time.

I set up a bank of variables duplicated in both devices.

I wrote a program detecting if each variable changed and would send it via the Network Resources into the REST protocol to set the equivalent variable in the other device.

Since I run most of my lighting scenes and levels via state variable already, it was a piece of cake to have one device doing logic and sensing, while the other operated my WiFi based lighting systems.

Eventually all got ported to the newer poLISY but the system worked like a charm during the port over. No delays were noted.

Thanks. Do you have an example? I haven't used rest commands in network resources before.