I searched for this answer pretty exhaustively, I thought, and could find nothing. For example, this site has both #hashtag and #hashtags which could/should be consolidated. I started this new topic here with a question mark and backed out to explore what the Alias field was for in the Edit Hashtag dialog. I thought it might be a way to include the topics under that hashtag in the filtered results under another, and expected the dialog to allow the addition of more aliases. Turns out that Alias is an alias for "Move", i.e., move the topics with that hashtag to another. Having done the Update of the hashtag parameters with the Alias field filled, it now has no topics and can be safely deleted. Ergo, the merge or combine that I was looking for.??
