When using a work plane, you can modify its grid by:
To modify the work plane grid
Work Plane panel


Modify panel
(Rotate), and rotate the grid. For full instructions, see Rotating Elements. 
When you rotate a work plane grid, the new orientation affects placement of components and affects the rectangle draw option for walls and lines. For example, if you rotate the work plane grid and then place a component, the component is oriented on the same angle as the work plane grid. If you create a chain of walls with the rectangle option, you can create them in the orientation of the work plane grid only.
