Thanks for the reply - that's sorted that out for me, however I
think this has highlighted a bug in the software (I can't try this on another laptop so I can't verify right now whether this is just my machine or not).
So - in the "cell properties" screen, I click on the Property Set "Breaks"as per your instructions. Now this is where my issue arose - what's happening is that the Conditions and Clone buttons are invisible at first because you have to page down - so the issue is that if you don't know those two boxes are there, they're a PITA to find (because the part of the property cell that gets cut off at the bottom of the "page" just happens to line up perfectly with the bottom edge of the Copy, Rename and (Down Arrow) buttons. The screenshots will show you what I mean
Maybe it only looks like that on my laptop, but if you need any more info (screen resolution, anything) just let me know - I'm happy to help.
(Edited for clarity)