Click Split in the Create group on the Sheet Metal tab.
Select the Select Two Cutter Points tool guide.
Change the selection for the Relief tool, if necessary.The shape of the end of a
partial split is determined by the type of relief selected for the Relief
tool. The Relief tool is set to Square in the example below.
Click a point on an edge.
You can enter a dimension for the percentage of the distance along the edge
or the distance from the end of the edge.The yellow ball turns green
when the endpoint snaps to a point.