I am trying to use 3D Annotation in SolidWorks for the first time.  It seems pretty easy, but I have run into a stumbling block.  I have a large bore that is shown as a datum.  If I were making a draiwng, I would take a section and show the bore diamter and list it as Datum B,  Can I do thie in 3D Annotation?  IF so, can someone give me a step by step?

Thanks in advance!