Can you prevent parts of a Word document from printing?



We currently prepare detailed technical specifications using an application called "Help & Manual", but for various reasons I would like to switch to Word 2012.

One useful feature of "Help & Manual" is that in the navigation pain you can quickly mark sections as "do not print". These are then skipped when the whole document is printed to .pdf.

This is a useful feature as we can include detailed notes, tables, diagrams etc for our own use safe in the knowledge that they won't appear in published documents.

I'm sure there must be a way to achieve this in Word, perhaps using Styles or Sections, but I haven't found one yet.

Any suggestions would be gratefully received.

Thanks,
Mark