Employee availability formula

Copper Contributor
I am trying to use an excel table to calculate employees that are already scheduled in a column, so that at the bottom I have a list of what employee resources are still available to be assigned.
So I have a very simple single sheet table with jobs sites in column A, rows 1-20 being a different site. Employees are in column B and assigned to jobs by row (b1-b20).
How can I assign a value to the employee names to get a running total at the bottom of employees that are available to put on jobs.
2 Replies
Please attach your sample file with manually entered results.
See may, week 1 for example of what I'm looking for.