You can lock a 3D view in order to tag elements and add keynotes in the view.
Video: Create a 3D Detail
Note: Because you cannot lock a default 3D view, you cannot add tags to a default 3D view. You can lock a perspective view, but you cannot place tags in a locked perspective view.
The following tag types are not allowed in a 3D view:
Material tags
Area and room tags
Space tags
Tags and keynotes can only be placed in a 3D view that has been locked. A command on the View Control Bar controls the locking of 3D views. There are 3 options when locking/unlocking a 3D view:
Save Orientation and Lock View
Locks the view at the current orientation. You cannot orbit the model in this mode.
Restore Orientation and Lock View
Restores an unlocked, reoriented view to its previously locked orientation. Any tags and keynotes placed at the original orientation will display.
Unlock View
Unlocks the current orientation, allowing you to navigate and orbit the 3D view. Any tags or keynotes placed in the view do not display until you click the Restore Orientation and Lock View command.
Note: By default, the leader for tags in a 3D view is set to Free End on the Options Bar. This setting is preferred for elements that may require adjustments to 3D tags, such as walls.
To save an orientation and add tags and keynotes in a 3D view
Open the 3D view in which you want to tag elements and set the orientation.
On the View Control Bar, click Save Orientation and Lock View.
Note: If the 3D view is a default orthographic view, usually named {3D}, you will be prompted to rename the view because you cannot lock a default 3D view.
Add tags or keynotes to untagged elements as desired.
Note: If you change the orientation and click Save Orientation and Lock View, a message warns that any previously placed tags and keynotes will be deleted. You can proceed or cancel the command to save the new orientation.