Combining Tables that feed from another data set

I have an Excel sheet that tracks when our company vehicles are used by different departments. I am trying to create a table that would serve as an automatic usage tracker, which will tell us how many days per week and month each department uses the vehicles. I have the data being input into the attached tables per week, a copy attached here. But I cannot figure out how to combine these tables into one data set for the entire month.

Please help me! I have been researching, and it sounds like I should be using a Power Query? But when I have tried, it always gives me an error message.