I'm struggling to elaborate an Arrayformula to enumerate the different elements of a column, I have five different type of jobs and I have each job numerated independently. I've prepared a Spreadsheet with the elements in Column A and the desired result in orange
https://docs.google.com/spreadsheets/d/1IYlXY_HyO3lihs4NHilhPXPWyX_L86WRjGUEHQZtEpY/edit?usp=sharing
Thanks