Help needed on Selection

I have a table in the following format

empl jan feb march apr.......... Dec YTD

in months column the hours worked in that month are displayed and in YTD the whole hrs from a selected date range is being displayed.

Now I have a problem when I select between june and sep the employees who didnt work in that time are not displayed. I want them to be displayed bcoz the YTD hrs still matters.

IS there any way I could get all the employee list there