Space separation lines are special model lines that are room-bounding. You use space separation lines to separate one area into many areas where a wall between areas is not desired or not possible. The new areas become full-bounded even though they are unbounded or semi-bounded by architectural components.
After these areas are created, you can place spaces in them and assign the spaces to zones. In this way, you can separately control the spacial environment of multiple areas within a larger area. Because space separation lines are room-bounding, space boundaries are determined by the space separation lines along with other room-bounding components. Space separation lines are visible in plan and 3D views.
The illustration above shows 4 open areas that were made fully-bounded by space separation lines (lower left). The lobby and heated entry were semi-bounded areas (bounded only by the radius wall). The 2 heated patios were unbounded areas. After the areas were fully-bounded, spaces were placed in them.