heres my config:
heres the item list:<?xml version="1.0" encoding="utf-8"?>
<prefabs>
<!-- NEW WALLS START -->
<Opbg name="BackWall LF1" identifier="FF_Wall_LF1" description="Command wall 1" allowattachitems="true" width="16" height="16" resizehorizontal="true" resizevertical="true">
<sprite texture="Mods/FrithsWalls/Content/Map/LF_BackgroundWalls1.png" sourcerect="334,0,690,229" depth="0.98" premultiplyalpha="false" origin="0.5,0.5" />
</Opbg>
</prefabs>
Sseems to work, adds new item to structure menu in sub editor<?xml version="1.0" encoding="utf-8"?>
<contentpackage name="FrithaWalls" path="Mods/FrithsWalls/filelist.xml" corepackage="false" gameversion="0.9.1.1">
<Structure file="Mods/FrithsWalls/Content\Map/FrithsWalls.xml" />
</contentpackage>
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