Perhaps others are giving me too much credit for knowing what I am doing :-) My basic question was perhaps too basic (certainly too basic for EE). The part of your response:
...for a census I would have something like "1910 US Census, location..." The hairy part come in asking yourself when to stop with the "location...". I like to keep my source records generic so I stop with the state level and report the remaining detail in the source_citation.page field I.e the citation-detail...
responds to that question. My Source Titles (also listed under the FTM2011 "Source Groups" tab) are perhaps too generic (e.g. "1881 Census of Canada"), so I will have a bit of work to do if I split them out in greater detail.
Thanks very much for the suggestions, all.