WHM as root > Edit a Package > my reseller packages, yes it is
i can manually edit them one by one after the resellers created new package
but how to set to 25 & prevent change in WHM as reseller > Add a Package like in first post above?
You'd need to limit your resellers to using specific packages. When you do this they can only use the packages with limitations you select.
Specify which packages $USER can use for account creation.
The system automatically grants access to packages that the user creates, unless you limit account creation to pre-assigned packages below.The system does not automatically grant access to system-created or root-created packages, unless you specifically define them below.