I've been reading the tutorials but I wasn't able to do what I need.
I have two Excel files with different data (can't put all in one), but there's a common field: PROJECTID. So, what I'm trying to do is to join both in the same spreadsheet in Tableau, getting for example, by PROJECTID the total revenue from the first source and hours worked from the second one, all in the same sheet.
In case you haven't figured this one out yet, you'd need to do a blend in Tableau. Here's the tutorial: