To modify the direction a form extrudes

Select (Modify Form Direction).
The Offset/Direction dialog opens, and the Extrusion Direction check box is on by default.
Do one of the following:

Enter the X, Y and/or Z coordinates defining the direction(s) the form extrudes to.

or
Click Define to define a new extrusion direction by entering two data points.
Identify the form to modify extrusion direction.