To update or change specifications to a hosting package (once it has been created), access the WHM system under Packages and click the Edit a Package option:
Clicking Edit a Package will display the list of hosting packages defined in the WHM system. To update a hosting package specification, click on it to highlight it, and then press the Edit button:
Clicking the Edit button opens the hosting package specification screen. In this screen you can edit the package specification and save the changes.
Please note: Updating a hosting package specification will affect all sites defined under this package. For example, if you reduce the maximum hosting of the package, the maximum hosting of all sites defined in this package will be reduced.