You can specify extrude direction with 2D and with 3D sketches by specifying a direction vector as the Direction of Extrusion. Direction vectors include:
|
Cylindrical faces |
Linear edges |
Reference axes |
Vertices |
|
Points in reference geometry |
Conical faces |
Sketch points |
Linear sketch entities |
|
Reference planes |
|
|
Planar faces |
|
|
|
|
|
Preview - normal extrude
Sketch entity used for Direction of
Extrusion 
Using sketch for Direction of Extrusion
Extrude applied