So, if I wanted something to turn into a different item, where's the syntax for it? [ > Player | Crate ] -> [ > Player | > Rock ] What if I want

So, if I wanted something to turn into a different item, where's the syntax for it? [ > Player | Crate ] -> [ > Player | > Rock ] What if I want something to slide over multiple tile spaces? Where's the syntax for this? [ > Player | Crate | ] -> [ > Player | | > Crate ] What if I want the item to progressively become more difficult to move, say for instance if I'm moving a snowball. Where's that syntax? You'll have to explain what "more difficult" means to answer that one!