You can make a Pick Ticket Inactive. The Inactive Status is halfway to delete and the record will no longer show unless you specifically look for it.
Go to the Orders module. Edit the Pick Ticket you need to inactivate either from the list view
Or from the Order Tracker [OT]
Untick [Active]
Click [Save], then [Close]
The Pick Ticket is now inactive and shows as crossed out on the Order Tracker.
The product quantities will be released back to your closing stock and available for you to pick for other sales orders.