A work plane is usually parallel to one of the global planes XY, YZ, or XZ, which are defined by two axes of the global coordinate system. However, you can also arrange the work plane as a plane in any inclination or align it with a line, member, or surface axis.
From left to right, the buttons shown in the image mean:
- Open the "Work Plane and Grid/Snap" dialog box
- Graphical selection of the work plane origin
- Parallel setting of the work plane to the XY plane
- Parallel setting of the work plane to the YZ plane
- Parallel setting of the work plane to the XZ plane