Yes! Once you click ‘import’, Scouts | Terrain will open straight up into the activity view, as if you were creating an activity yourself. Most information here will be prefilled, but you will need to assign an organiser from your Patrol, Unit or Group to ‘take ownership’ of this imported activity for your Patrol, Unit or Group.
Remember that only members of the Unit Council can import an activity. Once they assign an organiser, then this person can also help plan the activity.