You can’t just “make an OPC tag” like you can a memory tag. It has to exist on the server you specify, and you either have to know the OPC Item Path in advance or let it get auto-populated by creating the OPC tag via drag n’ drop from the OPC/device browser.
Glad I read this as that helps me out on this thread Edge Best Practices. Even though I cant browse the OPC tags I can still manually enter them knowing the address that will be used later on.