CADWorxP&ID tab: Process Lines > Mend Line 
CADWorxP&ID tab: Instrument Lines > Mend Line
Process Lines toolbar: Mend Line
Misc toolbar: Mend Line
P&ID menu: Utility > Mend Line
Command line: MENDLINE
Manually or automatically mends process and instrument lines by removing gaps between the lines.
For manual mending, select two or more separate lines that need to be joined. The lines must be within the tolerance defined by MendLineDistance.
Automatic mending joins lines when a process or instrument symbol on the line is erased. Vertices on polylines that were created when the symbol was inserted are also removed. If a reducer is encountered on a process line, the gap on each side of the reducer is closed, leaving a polyline with a vertex at each end.
To combine process line segments into a single line, see Combine Lines.