Unfortunately, we have not found anything related to ase to a3s conversion, beyond the fact that both files are scenes from 3ds Max, most probably different versions of it. It might be that you can simply do export between the content, but it is also possible that this requires some kind of manual work. In any case, you can always reach out to the huge 3ds Max online community or even Autodesk support.
Updated: August 7, 2023