I'm new to Infopath and need to know if the following is possible and
some guidence on how to do it.....

I'm creating a timesheet to record each job I complete for a company
and what cost center within that company to charge to.  I then need to
have a summary of the weeks work for each comany and cost center in a
table to present to Payroll.   I have gotten as far as using a
repesting table to add a new line for each job but can't work out how
to group then summarise the time.
Also, can you have a dropdown selection within a repeating table?