nOnce you are happy with the way the mapping is right click and convert the whole thing to an editable mesh so all the changes stick.
nNow it’s time to name the object, all models must have 3 objects; LOD0, LOD1, and LOD2. But you are allowed to put a sub name on it like so LOD0.wall
nSince these are simple walls you should not have to worry about cutting anything down to meet previewer’s rules for Flora structures.