Unfortunately, this doesn't work. Although you can make junction or symlinks between folders, OneDrive will not automatically sync them and the files/folders status indicator will (most of the time) stay in the 'to be synced' state, giving you the impression that its not been uploaded/synced when in reality it has. The only way to force a sync is to pause/un-pause the application, but the status indicators wont change so you still wont know if something has/has not been synced without checking it. Self defeating. Way to go......