When you have a part in the middle (e.g., stiffener without chamfers) that you would like to label on a side view (in the figure on the right):
Before creating the cut view, enable the "Enable annotations on elements invisible in details" default (Management Tools, Defaults):
The cut view contains a point in the part that has no visible edges (see inside the cloud in the figure below):
Label the part by selecting the point during the Insert label command:
A label for a part without visible edges is created:
Important: The view, where you want to label the invisible part, should be created with a presentation (drawing style) where visible and hidden lines are switched on (see figure below):
