If i have understood you correctly then you can't have a switch in client mode and then configure new vlans in the vlan database on that switch. You have 2 options
1) Add the new vlans to the VTP server switch and have these vlans on all switches and use pruning or vlan allowed to restrict where the traffic for these vlans can go.
2) Convert the switch to VTP transparent. It will still have all the vlans it had when it was a client and you can then add new vlans to it.
If i have misunderstood please come back.
Jon