visible in the selection info panel.
</p>

<p>
You can use them to mark particular buildings to keep track of them, and they can be loaded in from external GIS data when creating a new map.
</p>

<p>
To set a custom field:
</p>

<ol class="org-ol">
<li>Click the <b>+</b> button in the header. This will add a new column.</li>
<li><p>
Type the field name in the cell that appears in the header for the new column.
</p>

<p>
A dropdown menu will let you select existing fields for the selection, or you can type a