Perhaps I just haven't figured out how to do this, but there does not appear to be a way to apply a flag to multiple selections. Some previous posts on flag markup I think also address that it would be nice to have a more streamlined process for tagging and highlighting items. In my case I want to mark or tag articles I have printed (versus those I only have in electronic or citation form). It would be nice to be able to do this without manually entering a tag for each item.