Finding subject/topics linked with specific hymn

When planning a service, I find the topic/subject search very handy for getting lists of hymns to consider.  But at the moment I am indexing a privately printed hymnal used at a church I work for, and wonder if there is any way to go from the text to the topics it is linked to. 

For the sake of my self-esteem, I hope that this is not a painfully obvious feature, but nevertheless I'm not spotting it.  Your help will be deeply appreciated.