You can simply enter the VLAN interface and state no ip address. config interface vlan 10 no ip address 192.168.100.1 /24 ip address (new ip) (new mask) exit show vlan (to verify the change)
How do you change or remove an IP address associated with a given VLAN?  I have a few powerconnect 6248 switchs, and had created all of the appropriate VLAN's needed.  I assigned the IP address to each VLAN via: interface vlan 10 routing ip address 192.168.100.1 255.255.255.0 However, I realized I needed a different IP.  What is the best way to change this?  
change the assigned IP address of a VLAN