Hello,
You have to open the zone object;
1. Choose a zone in the plan
2. Open it with library part editor; File -> Libraries and objects... -> Open object...
3. Write in the properties program;
component "wallnetsurf", ROOM_WALLS_SURF-ROOM_DOORS_SURF-ROOM_WINDS_SURF, "m2"
4. Save the zone object
Now the wall net surface can be listed in the Lists -> Components.
(Please note that the components can't be listed in the scheldules, only in the old-fashioned lists).
Hope this helps.
--
Juha