Very many thanks for these two most helpful responses. Having tried both Note and Anecdote tags it seems that the latter does exactly what I want in exporting to Second Site and the Web just the content of the tag Memo box with no introductory text - and the sort date allows this content to be positioned at the right point in the narrative. Perfect! I'm most grateful for the help.
The support and tutorial materials offer much advice on editing tag sentences, but I wonder if it is possible to designate one tag (perhaps Indiv Note) that prints and exports without any preliminary sentence - just showing the content matter from the tag box? The editor seems to insist on adding a phrase of some sort.