Changing IP addresses fails

I inherited a server that I need to move to new internal and external ip addresses. I have tried at least five times following instructions I have found on the subject and all I manage to do is blow up the networking of the virtual server and have to reload the snapshot. Some guidance would be appreciated. Currently: the Basic WebHost Manager Setup Config IP address is xx.xx.240.36 (external) the system has a second address listed in the IP Functions Show IP Address Usage xx.xx.240.35 (external) ens192 has a local ip of 192.168.10.10 assigned as the main/shared IP for root and website1 and the public IP xx.xx.240.36 ens192:cp1 has a local ip of 192.168.10.13 dedicated to website2 and the public IP xx.xx.240.35, shows as dedicated to website2 I don't know why there are two internal and external IP addresses, and I don't understand how to change them so that everything works in the end. If moving to a single internal and external IP address makes this easier that would be fine. What I am hoping for: external IP of xx.xx.97.163/28 internal IP of 10.0.50.10/24