You should really reconsider using a plugboard to do it, if what you want is to get them to show up in proper order on your ereader. It's really not difficult and you just have to do it the one time, whereas this way you'll have to change all your book titles.
You just go to Preferences, then Metadata Plugboards. Under Add new Plugboard, choose Format - epub (I'm guessing), and Device - Kobo (or Kobo touch maybe, not sure as I have a kindle). In Source Template put: {series:|| }{series_index:0>2s|[|] - }{title}. Then in Destination Field put title. Hit save plugboard, and Apply, and that's it.
After that whenever you send a book to your reader the series will be before the title, provided your metadata is correct.
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