The Placement section of the allows you to specify which beams you intend to annotate (either all in view or just the beams selected). As noted on the Beam Annotations tool, Revit does not overwrite existing tags.
To place new annotations and remove existing tags on beams in the current file, select Remove existing beam tags and spot elevations. All tags and spot elevations will be removed from beams in the current file and replaced by those specified in the Beam Annotations tool. When deselected, no annotations will be placed on beams with existing tags.
To tag beams in linked models, select Include beams from linked files. Beam annotations that were placed in the host file on beams in the linked model can be deleted with the Beam Annotations tool. However, beam annotations that were placed in the linked file cannot be deleted. If you select Remove existing beam tags and spot elevations, and there are linked-file annotations on beams, a dialog displays. You can choose to:
The Horizontal End Offset and Vertical Offset settings adjust the distance of tags and spot elevations from their attachment points (see ) by the entered measurement. This measurement is representative of the drawing scale and its default is 0" horizontally and 3/8” vertically.