Can a source be manually added to a Smart Group?

I have an article that I would like to a Smart Group but have been unable to get it added automatically (and I’ve tried many different approaches to set up the Smart Group filters to add it). Is there anyway to manually add an article to a Smart Group or do I need to create a regular group that contains all of the Smart Group articles and additional ones that the Smart Group won’t allow? Thanks.

I don’t think so.  It is a smart group and not supposed to need us lowly manual folks.  But I usually get around this by adding a keyword  to any additional refs I want, and use that to add to my smart group parameters?  

Thanks Leanne! Adding keywords to the records worked like a charm!