Need help with script involving making trees appear/disappear

[lllDash]

Unfortunately static objects can't be disabled through the use of scripting, only entities have that feature (well, most of them) and trees are categorized as static objects. There is a way to convert an object to an entity and that could possibly be done using a model editor that is compatible with Amnesia, but I don't know how.
But people have done it before. Sorry.