Insert references from list throughout document

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Word / Office 2010 windows.


Using word doc to create notes as I research a large book. In the book I am noticing several themes I would like to isolate and study.

Example:
I'm making notes and come to a paragraph that discusses "politics". As I start my notes on that paragraph, I would like to access a predefined, by me, drop down list that has say 8 topics to select from, "politics" "art" "music" etc. I would then select "politics" to place a marker at this point in my notes doc. Later when I have 50 pages of notes, I would like to be able to jump to each point in the notes where I have selected politics. This way I can isolate and study that theme independently of all other thoughts.

I suspect there is an easy way to do this but I am not really up to speed on Word's functions. Any help will certainly be appreciated.

Thanks!
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