In a multi-segmented, equality constrained dimension, you can use the anchor symbol to designate the anchored element. The element that is anchored remains stationary while you move other elements in a dimension.
- Create a multi-segmented dimension.
- In the drawing area select the dimension, and click the Dimension Equality symbol (
) to make the dimension equally constrained. - Select any element that the dimension references, except the one you want to anchor.
Example
The following image shows the equality dimension, with the selected element in red, and an anchor symbol
near the dimension. 
- Click and hold the anchor symbol. A witness line appears for the anchor.
- Drag the anchor symbol to the element you want to anchor.
- Move any of the unanchored elements referenced in the dimension.
The element marked by the anchor does not move.
Note: If you select the element to which the anchor is currently attached, this action also moves the position of the anchor.