CADWorxP&ID tab: Modify > Rename Drawing 
Modify toolbar: Rename Drawing
P&ID menu: Accessory > Database > Rename Drawing
Command line: RENAMEDWG
Renames the current drawing. This command displays the Rename Drawing in Project Database dialog box.
Project Path
Displays the path of the project folder.
Current Name
Displays the current name of the drawing.
New Name
Displays the new name of the drawing after it is defined using Browse.
Browse
Specifies the new name of the drawing. Opens the Drawing to Rename dialog box. Type the new name in the File name box.