I guess I misunderstood, when you said you did an estimate for zero, I thought that meant you only wanted to track total hours and not the value.

Job cost in terms of labor hours, would mean you would have to move payroll expense (some portion of it) out of payroll expense and into job expense. Sorry I do not deal with payroll and reallocating it. Best I can think is track the hours, do the math per employee and then do a journal entry to move that value.

I'm sure there is a more elegant way, and hopefully someone will chime in.