In the Motion Mode drop-down list you can choose the method to be used to perform the sweep along the drive:

Constant axis:	The contours will be swept along the drive while keeping the axis constant through out the motion. From the Direction drop-down list you can select the axis direction.
Surface based:	The solid will be swept along the drive curve keeping an orientation based on a selected surface. In this case you need to select the edge of the surface as the driving curve for the Spine selector.
Along one plane:	The solid will be swept along the drive curve as per the orientation of a plane.
Ruled:	Ruled surfaces are obtained by joining the U points of equal value on two base curves with a suitable set of straight lines. In simple terms it is also defined as the set of points swept by a moving straight line. In this case the Spine selector does not get display in the selection list.

Additionally, a shelled solid can be created by specifying the thickness in the respective Thickness edit boxes of the profiles in the Graphics Area displayed on clicking the More Options node. The solid can be made of variable thickness when there are two boundaries. When there are more than two boundaries, we can make solid of non-variable (uniform) thickness only.

The resulting solid is associative to the drive curve and the cross-section profile. If you change any of them, the solid changes accordingly.

See "Using Spines" for details on how to use spine profiles.