Yeah, well you'll probably be glad to know that I'm getting closer to supporting a much larger range of columns in the girl list.
I think what you are really trying to do is to move the Day/Nigth columns.
Just adding columns is done by
AddToListBox(girllist_id, i, Data, 8, item_color);
increasing the "8" value. As long as Day/Night columns stay at place, what comes afterwards is your own choice. If you want to actually move the Day/Night column, heavier mod is needed because the game will always report Night/Day to column 7 and 8.
I've included my working screen management file, if it's of any help. Obviously the .xml file has to be modified accordingly.