If you want to just switch off—for agenda views—certain subtrees without moving them to a different file, you can use the ‘ARCHIVE’ tag.
A headline that is marked with the ‘ARCHIVE’ tag (see Tags) stays at its location in the outline tree, but behaves in the following way:
org-cycle-open-archived-trees. Also normal outline commands, like
org-show-all, open archived subtrees.
org-agenda-skip-archived-trees, in which case these trees are
always included. In the agenda you can press v a to get
archives temporarily included.
org-columns-skip-archived-trees is configured to
The following commands help manage the ‘ARCHIVE’ tag:
Toggle the archive tag for the current headline. When the tag is set, the headline changes to a shadowed face, and the subtree below it is hidden.
Check if any direct children of the current headline should be archived. To do this, check each subtree for open TODO entries. If none is found, the command offers to set the ‘ARCHIVE’ tag for the child. If point is not on a headline when this command is invoked, check the level 1 trees.
Cycle a tree even if it is tagged with ‘ARCHIVE’.
Move the current entry to the Archive Sibling. This is a sibling of the entry with the heading ‘Archive’ and the archive tag. The entry becomes a child of that sibling and in this way retains a lot of its original context, including inherited tags and approximate position in the outline.