CADWorxP&ID tab: Process Lines > Remove Line Item 
Process Lines toolbar: Remove Line Item
P&ID menu: Accessory > Database > Remove Line Item
Command line: REMOVEITEM
Removes a valve component that is associated with a process line.
When a valve component is placed on a process line, it becomes associated with that process line. When the AutoSizeSpecUpdate variable is on, the component changes as the process line changes. Use this command on an item if you do not want the valve to change with the associated process line.