CADWorx Plant tab: Line Number > Setup 
Line Number toolbar: Setup
Plant menu: Accessory > Line Numbers > Setup
Command line: NUMBERSETUP
Modifies any line number configuration. You can turn the line numbering system on or off. If the system is on, it can operate in a static or dynamic mode.
In the dynamic mode, CADWorx adjusts the line number according to the size or specification. In the static mode, you must manually change the size and specification. Static is useful when all components and sizes of a particular piping run are required to have the same line number (such as, the 3/4” vent on an 8” process line needs a line number of 8”-150-2001-N). Static line numbering is also useful when selecting runs of piping for other functions with CADWorx. For more information, see LineNumberSystem.
This system also works with a CADWorx P&ID setup configuration file. You can change the configuration file location in SETUP to use the same project configuration as any P&ID project. For more information, see Setup. Click Add in the Category group in this dialog box to select additional fields located in the process lines table of a typical P&ID project database. When using a P&ID project, changes made to a line number configuration within CADWorx reflect within the P&ID project.
If the system is not using a CADWorx P&ID setup configuration file, the additional fields are obtained from the DATABASE.TBL file located in the [Product Folder]\Plant\System folder. You must manually edit this file for any modifications required of the existing fields within the default line number system.