Define Marker Reference for Source Marker

When placing a new source marker on the Floor Plan to create a viewpoint, the tool’s Default Settings gives you two choices for defining the Marker Reference:
If you select an already placed source marker and open the tool’s Selection Settings or Info box, you have two additional choices, because the viewpoint may already have multiple drawings or views created out of it:
Note: The option to refer to a view is available in case the desired Drawing is located in a different project’s Layout Book (and is therefore not listed in the “Define Marker Reference” dialog box).
The link information that will appear in the marker is previewed in the Reference to text field, as long as the referred item (such as a drawing) already exists in the project.