Dimension-to-Instance AssociationKeyCreator \ Layout \ Overview \ Dimension-to-Instance-Association
Dimension-to-instance association refers to the link between a drawing instance and its related dimension(s). When you dimension a drawing instance, a link is established between the instance and that dimension. Once a drawing instance has been dimensioned, and the part modified after toggling to Model, both the drawing instance and the dimension(s) will update when you re-enter Layout mode. The automatic update is implemented by generating the dimension using the same entities you did when you initially created it. The dimension will appear to scale, but is only updating relative to the geometry it is attached to.
Dimension Association Links:
The associations, or links, that are established when each of the available options in the Universal Position Menu is used to place dimensions in Layout mode: