The Add Post-It Note command allows you to add a written note to a part or assembly in the scene.
At the end of the operation close the dialog box, an icon with the post-it symbol appears near the anchor to indicate that an note is associated with the part.
To manage note (view and edit ) right-click on the part and choose Open Post-It Note…
While to delete Note, choose Remove Post-It Note.
To manage more easily which notes to delete, drop the tool with the right mouse button in the scene, a dialog box shows all the notes and here you have a button to delete the ones you want.