You can create a link from one outline to another:
Select text in one outline
Click the "Edit Link" icon in the formatting popover that displays.
Enter the file path to the outline that you want to open when you click the link.
To get the path of an open outline use Atom > Edit > Copy Path. This path also includes the search query, hoisted item, and selected item encoded as query parameters. See the next section for more information.
You can append URL style query parameters to set state in the outline editor:
query - Set the outline search query. For example the path
todo.ftml and sets the search query to "moose".
hoisted - Set the hoisted item. For example the path
todo.ftml and hoists the item with id
XyW3dHDR. You can also specify the hoisted item in a URL fragment like this:
expanded - Set expanded items. For example the path
todo.ftml and expands the item with id
selection - Set selected items. For example
todo.ftml and selects characters 0 through 3 of item
XyW3dHDR. You don't need to specify all values, for example
todo.ftml?selection=XyW3dHDR will select the item with id