What formulas or workaround I could use to make this holiday planner work?

I want to create a holiday planner to keep track of the holiday used by a number of employees. These employees will be split into language teams:

I used this formula to create a monthly selector:

=INDEX(Settings!C4:C15,'Monthly Sum (2)'!V2)

Then:

=IF(D9="","",IF(EOMONTH($D$8,0)>=D9+1,D9+1,""))

Then:

=TEXT(D9,"DDD")

To change the days.

That works switching between each month and displaying the day.

But I would like to add another tab where it should show the total number of hours asked by employees split as per the second screenshot:

In the first tab every time someone adds a holiday it should be added like this:

Holiday-number of hours-h

So for example:

Holiday-8h Holiday-1h

And so on.

What formulas or workaround I could use to make this work?