yes Emad Jaddou, I know that it works when you have one word but leaves and payslips that has leaves included in its lines are as documents, so it would be better to have it with names that was given to leaves. The solution with quotes does not work. To have it as a variable:

leaveName = "Sick Leaves"
worked_days.leaveName.number_of_days 

also does not work.

best thing is to name them as one word, this should work as I tried that. It is possible also if you add quotes "" but I have not tried that.

worked_days.SickLeaves.number_of_days