easiest way to add a tag to multiple selected notes

I’d love to be able to select a series of notes and simply type the tag at the bottom of the display pane in 3-pane view. But I can’t. What’s the easiest way to add a tag to notes that already have a tag without putting them in a subordinated folder?

I select the documents, right-click, and select ‘Replicate To’ and then pick the tag I’m looking for. I believe Christian has indicated that this functionality will be improved in a later release.