Yes, either call CS or stop by your local Verizon store.
It will be most efficient if the person currently responsible for the phone and the person taking over liability are available.
There will be no ETF for the person currently liable for the phone if an AOL is done. They would be responsible for any current and/or past due charges for the line(s), though.
Depending on the credit history of the person taking over the line(s), there may be up to a $400 deposit required per line.