Cut a partial bevel on one end of the first piece of baseboard to fit against the door casing in the correct orientation. Start by ensuring that the compound miter saw blade is at center position and then tilt the blade left or right, as required, at a 45-degree angle to cut the bevel. This partial bevel cut will go through the upper portion of the plank's face, leaving the bottom portion un-beveled at 90-degrees. Before you secure this baseboard (or any baseboard) to the wall, you need to cut the other end for the appropriate type of joint (as described in the next two steps). If the baseboard will reach the corner, cut it to length angled for a mitered corner joint. If the baseboard ends in the middle of the wall and another baseboard extends to the corner, cut the end for a flat scarf joint.