Garrisoning an AT gun within structures and other types of garrisons is possible. This post and this post within my guide covers a bit of the basics for garrisons.
1. Determine the type of markers the structure has. In most cases the "combat slot" markers will be able to hold units within the garrison. You may view these by using archive viewer and opening the .mua files with a text editor.
2. Match the ebps hold_ext and holdable_ext types. Both the garrison and the garrisoned entities need to have their types match up within these extensions.
This should probably work. Note that the ABP of the garrisoned entity must have the default name, meaning you can't name it xyz.abp or something custom. Also note that the guide I linked is specifically for moving entities so you probably wont have to worry about a lot of the other things in there.
This will only allow you to add an AT gun, or whatever other unit, into a garrison. It will not allow any crew to man it. I believe having a crew is possible but it's probably very difficult to do.
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#Steam AliasWL%Streak
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