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.