On the Tools menu click Snaps to select Same X
SAME X is a special modifier that aligns points vertically with the reference point by keeping the x coordinate the same as the last point. (It's like a one-time ORTHO lock.) First select a drawing or editing command, then SAME X. CC3's prompt doesn't change. When you select the next point for the entity you are drawing, CC3 locks the point to the nearest point that lines up vertically with the last point used in drawing or editing. For example, select the first point of a line. When CC3 prompts for "next point:", select SAME X from the Modifiers menu. The prompt still reads "next point:". Use the cursor and left button to select a point. CC3 draws the line from the first point to a point directly above or below the first point. In other words, CC3 gives the new point the same x coordinate as the first point, and the y coordinate you picked with the cursor.
You can combine SAME X with REF POINT to align a new entity with an existing entity. For example, to align a new circle with the center of an existing circle: Select CIRCLE: RADIUS & CENTER (Draw > Circles > Radius and Center). When CC3 asks for a center point, select REF POINT from the Modifiers menu. Select CENTER from the Modifiers menu, then select an existing circle. CC3 resets the reference point to the center of the circle. The prompt reads "Center point:" again. Select SAME X from the Modifiers menu, then select a point below the old circle. CC3 draws the new circle with it's center perfectly aligned with the center of the old circle.
Text equivalent: SAMEX
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