You can select a resource type and modify the specification for that resource.
For more information, see Assigning Limited Rights to Zone Administrators.
global$ zonecfg -z my-zone
zonecfg:my-zone> select rctl name=zone.cpu-shares
zonecfg:my-zone:rctl> remove value (priv=privileged,limit=20,action=none)
zonecfg:my-zone:rctl> add value (priv=privileged,limit=10,action=none)
Note that even if you did not explicitly type commit at the prompt, a commit is automatically attempted when you type exit or an EOF occurs.
Committed changes made through zonecfg take effect the next time the zone is booted.