The Mirror function will create a Mirror copy of the selected object along the selected axis.
Select the object to be mirrored.
Click the Mirror button. Â
Click on the start of the plane of reference:
Left-Click sets the point under the cursor
Right-Click snaps to the nearest point
Draw the line to use for the axis reference by dragging the mouse. A dotted line is displayed for reference.
Holding down the CTRL key will move the cursor in Ortho mode.
Click to place the Mirrored object along the axis reference that was drawn.
Flip
Edit > Flip Design