Not yet. The groundwork is in place: the is_attachable setting on pay codes marks which pay elements count as attachable earnings, so the base an order is calculated on is already modelled. The orders themselves, the priority rules between orders and the protected earnings floor are on the roadmap.
What should I do in the meantime?
If this blocks a particular integration or employer, contact us so we can look at the sequencing with you. For the rules themselves, see "Attachment of earnings orders and Direct Earnings Attachments".