European Copywrite Taxes

Hi, we sell goods into multiple European countries, which require certain taxes to be applied per product. E.g. Size. This is different per country. We currently use a customisation to handle this but,without any experience, is this something alvara would do? I have no idea of usa states taxes but looking potentially for an out of box solution. It does work at the moment, and actually there is not much wrong but I am looking at standardising elements. TIA