How do you draw a P&ID in AutoCAD?

2 Draw a line in the middle of the drawing area. 3 On the ribbon, click Home tab ➤ Draw panel ➤ Circle drop-down ➤ Center, Radius. 4 Press and while holding down Shift, right-click in the drawing area and select Midpoint from the Object Snap menu. This specifies the center point for the circle.