There have been a few updates on math operations within workflows but we still can't select or use opportunity custom fields within Math Operations. We have several use cases where it needs to be done within an opportunity and not at contact level. E.g. calculating commission figures (10% of opp value for instance or based on another custom numerical or monetary field), dates (x-days before/after) etc. As these are unique to the opportunity and there could be multiple opportunities at any given time per contact, having it just at contact level isn't sufficient. 🙏