org-archive-to-archive-sibling
org-archive-to-archive-sibling is an interactive autoloaded Lisp function in `org-archive.el
'.
(org-archive-to-archive-sibling)
Archive the current heading by moving it under the archive sibling.
The archive sibling is a sibling of the heading with the heading name
`org-archive-sibling-heading' and an `org-archive-tag' tag. If this
sibling does not exist, it will be created at the end of the subtree.