Login to WHM server
Go to Account Functions.
Select an account using the domains and users in the list, or search for an account below.
If you need to change multiple site’s IP addresses, you can do it, in the same way, using Home »Multi Account Functions »Change Multiple Sites’ IP Addresses option.
Select multiple accounts and press ‘Change IPs of selected accounts’ and proceed further.
This process will change IP in apache configuration, DNS configuration, etc