What policy are you trying to do? You just setup the Static NAT with the external IP (s) pointing to the internal IP address you want and then you create a rule (or rules) which have the source (From) ...

I'm helping my son set up a Blue Iris box at his Mom's/my ex's house. She has Spectrum with their provided Askey RAC2V1K router. BI is running on Win10/64, and port forwarding is set up in the router, ...