formula for creating a shift pattern

Hi Guys, I'm a total newbie and I have followed an on-line tutorial on how to build a employee roster, I have a list of example employees in the
roster and on each month in the employee section I have a drop down box where I can choose the appropriate employee and it will fill in their
clock number etc, etc., but what I want to do is on another pager create a drop down box with the names and then enter a shift pattern for each
person and a start date and then it will fill the roster you with that persons shift.

I know this is a lot to ask but is this possible?

Also can you give my roster the once over to let me know if I need to modify anything?

thanks