This article addresses a feature in Revit that seems to have gone unnoticed by many Revit users. That feature is the anchor symbol for multi-segmented equality constrained dimensions.
Part of the power of Revit is that when a multi-segmented dimension has had the quality constraint applied to it by picking the EQ symbol, the objects being dimensioned will move in equal distances when one of the objects is relocated. The anchor symbol gives you more control over that dimension function.
The anchor symbol allows the user to control which object is the anchor and will stay stationary when adjusting the spacing between objects that have had an equality constraint applied to the dimension string. If the user is not aware of this anchor symbol, then it appears that they have no control over which objects move and which one stays in the same position. It is nice to have the ability to specify which objects move and which one stays in the same location.