helm-org-agenda-files-headings, used with helm-org-format-outline-path is very convenient for choosing entries when refiling one individual entry. I couldn't get it to refile *several* entries at once.
I tried + marking entries with C-space in helm-org-agenda-files-headings, moving to another entry then "Refile current or marked heading to selection C-c w" with no success: it only acts on one entry + marking the entries in the agenda view with m then again helm-org-agenda-files-headings, moving to another entry then "Refile current or marked heading to selection C-c w". It doesn't use the "m" marked entries + marking the entries in the agenda view with m and choosing the refile action in Bulk mode (B-r) but this doesn't use helm-org-agenda-files-headings. In my opinion, the most convenient way would be to have the "Refile current or marked heading to selection C-c w" action from helm-org-agenda-files-headings act on the "m" marked entries in the agenda mode. Julien.