Can I place soldier barriers and attack them to an object, and once that object is destroyed have the barriers be takin down? If so, is it an ODF setting or an XSI thing. I suspect this thing exists, casue ai never walk purposely underneath an at-at.

I ask this because on the map I am working on there is a situation where hub weights would be much harder to work with and not as efficient.

I really doubt it would work, but I haven't done much with barriers aside from putting borders on the map. You'll probably have to just put it in the AI planning, there's no way you would be able to attach a barrier in the ODFs or XSI that I can see.