As far as I can see you need a table with employees/houseman with their name, shift and rate (among other info).
Your main table should be the event table. This is the variable.
The events will steer the dates/hours for the housemen.
There is an event, date, duration, place etc.
This is the variable info.
To this events you want to assign housemen.
According to your previous posts, it's nearly a 24/7, together with your 3 shifts.
You need an 'in between' table where you will assign those employees to an event, with the dates and duration for each of them.
In the event table you can make a portal, where you can fill in the names, and duration for each assign employee.
With the allowed recordcreation on, this will create records in the Itemtable (the inbetween).
In this table you can make your calcs for the hours, rates etc, needed for each employee, and also generate your reports.
This is in short an overview how you could do it.
But I want a second opinion (Striker) before we go further in detail.