You may want to assign specific IP addresses to a reseller. This is done with Restricted Delegation for resellers.
Our documentation is available at: Manage Reseller's IP Delegation
Log into WHM and access "Manage Reseller’s IP Delegation" under resellers.
If there is more than one reseller you will be prompted for the reseller. Select the reseller and then submit. If there is just one reseller then the reseller election page will not appear and the settings changed will be for that one reseller.
Next click the radio button for "Restricted Delegation" to get a list of available IPs and the resellers that are assigned on that server.
Next set the desired IPs and then save.