On the Tools menu click Snaps to select Reference Point when the command prompt requests a point to use this modifier.
CC3 stores the coordinates of the last point used in drawing or editing an entity--for example, the end of a line. CC3 uses this stored point as a reference point for the SAME X (vertical-lock) and SAME Y (horizontal-lock) modifiers and to calculate the three forms of relative coordinates. You can use the REF POINT modifier to change the reference point to any other point.
First, select a drawing or editing command, then select REF POINT. The prompt reads "Reference point:". Select a new point with the crosshairs, use a modifier, or type coordinates.
REF POINT is especially effective used in combination with other modifiers to set the reference point to the endpoint, center, etc., of an existing entity.
Text equivalent: REF
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