Create an Empty Outdoor Database
Creating an empty database can be simply done by selecting Urban Building Database and Draw manually must be enabled.
from the menu. In the dialog
Figure 1. The Select type of new database dialog.
In the next dialog, the coordinate system must be specified by the user:

Figure 2. The Coordinate System dialog.
Finally, the default materials for new buildings and vegetation objects can be defined. After closing the dialog by clicking on OK, WallMan creates a new urban database.

Figure 3. The Default Values for New Buildings dialog.