What are you trying to do, Coribien? Power Query is used to transform data from one form to another. Are you showing us your starting data or what you want to end up with? Can you provide a workbook showing some input data and the output you want? There are many people here who can find a solution to your problem without having to create duplicate column names. For example, you could use Power Query to create a table with just four columns (Marco, Semana, Projeto, Hora Extras) and then create a pivot table from that.