You can establish and monitor relationships between 2 elements of the same type in the current model without copying the elements.
When a monitored element changes, a warning message displays.
You establish relationships between pairs of corresponding elements. For example, select a grid line, and then select another grid line to form a relationship between them. You cannot monitor unlike pairs, such as a grid line and a level. If you select an opening in a wall or floor, you can monitor other openings or inserts.
To monitor elements in the current model without copying
The monitor icon displays next to the element to indicate that it has a relationship with another element.
An architectural column and a structural column (plan view) with a monitoring relationship
If you modify one of the elements in a pair, a warning indicates that a monitored element has changed. These warnings also display in a coordination review.