There is a second remote Poe switch on second floor which is connected into nvr lan port which has 15 cameras connected
All cameras are in range of 192.168.254.2. to 192.168.254.24
OK, that's clearer, I think I understand now. You have configured the NVR LAN IP address to be on the same range as the PoE ports interface.
Customer network is 192.168.1.1 with only one lan port being used for Poe switch on second floor where would Network cable run from customers network connect
The first step would be to either connect a cable from the customer network into the PoE switch on the second floor, or if that is not practical due to location, you would need either:
Both the NVR LAN port and the cable from the PoE switch on the second floor connected to the customer network.
Or
Add a new switch near the NVR and connect the NVR LAN port to the new switch, the second floor PoE switch to the new switch, and the customer network to the new switch.
So the customer network cable gets added to either the second floor PoE switch, or one cable each to the NVR and also second floor PoE switch, or one cable to a new switch near the NVR.
When you have done this, the NVR and the 15 cameras are all physically on the customer network - but with incompatible IP address ranges.
To make the NVR and the 15 cameras logically accessible, you will need to change the IP addresses of both the NVR LAN interface and all the 15 cameras to values on the customer network that the customer will assign to you.
With a PC connected to the customer network, you should be able to make all the IP address changes on the 15 cameras and the NVR using SADP, even when they are on the different IP address ranges.
Then you will have to use the Camera Configuration menus on the NVR to change the camera IP address definitions to the new values.
This sounds complicated - but it isn't if you approach it logically.
Be aware that when the NVR and the cameras are on the customer network, anyone on the network will be able to access them.
If that is not desirable, a more complex network arrangement will be needed.
I hope that makes sense, and I have understood correctly.
Good luck!