In the example below, the Add Extrude function is to be used to extrude the circle.
Note: A prerequisite
of this operation is that the reference face (the face that will define
the extrude direction) belongs to a part that has been split using the
QuickSplit function.
Example:

By default, the extrude direction is normal to the sketching plane, in this case, outward from the diagonal face.

Click on the arrow origin, and from the menu select By QuickSplit Direction. Pick one of the faces belonging to the set which is split in the required direction.
Note: It is also possible to pick the face of another part that has been split.

The extrusion is created in the direction of the split.
