Just make sure, the house, where you want to do that,
is one, which can be entered.
:there are some dummy houses, and there are some which
can be entered.
Once you place a waypoint on such an "open house", there
will show up a new feature in the waypoint's menu somewhere on the right in the middle (if i remember right, it's below the
behaviour setting). Now you can choose the position in the
house, where you want your unit to go - position1, position2,
etc. (depending on how many positions there are).
~S~ CD