Power Query - Combine and Match

Bahama85 You should see a third query in your workbook along with a third tab showing the results:  It requires only two steps

1. Within the Table3 query, select Merge Queries from the menu,
2. select Table2_2 in the merge window
3. Hold CTRL and click on each of the three columns for Conf.dt., User, and PAr on both the upper and lower section of that window and click okay.  Ensure that whatever sequence you use to select the columns in the top is the same for the columns in the lower

Now your table should have an extra column.  Press this little button int he corner of the Table2_2 cell and deselect everything but hours.  

That will give you a single table with the results from both merged together. 

Just in case it didn't save to your drive properly here are the two steps I added (within the editor, select "Advanced Editor, place a comma at the end of your last step and past the two steps prior to the "in" clause below.  

    #"Merged Queries" = Table.NestedJoin(#"Grouped Rows", {"Conf.dt.", "User", "PAr"}, Table2_2, {"Date", "Name", "Account"}, "Table2_2", JoinKind.LeftOuter),
    #"Expanded Table2_2" = Table.ExpandTableColumn(#"Merged Queries", "Table2_2", {"Hours"}, {"Table2_2.Hours"})
in
    #"Expanded Table2_2"

As a side note, to handle all the re-naming in your query, you can create a name mapping table in your workbook with the original names as reported, and the "Display" names you'd like to see.  I added that to the workbook and my copy of the query so you can see how many steps it can eliminate.  

Hope this helps,

Dexter