This would be better posted in Designer Desktop as it's not a Machine Learning use case and there will be a lot less people watching this discussion board.
You need to set up your data and show what it looks like (and a sample of the data ideally).
You just need
- A list of the registrations
- Summarise that to get the total per part
- Summarise in PARALLEL for whatever other totals you need
- Join or append these totals on
- Formula to work out the percentage.