Originally Posted by AndrewX

It is not possible to set up cPanel to have multiple domains per IP, it is a cPanel limitation, it's an old panel. You have to create separate reseller accounts in WHM, assign a private IP to each of them them and add the domains in each of these cPanel accounts as addon domains.

Hope it makes sense. In our Virtualmin panel it's a piece of cake, you enter the domain name, a password and choose your IP through a drop-down list.