I agree with @Mark Nealey that it's hard to come up with ideas, but I'll give it a shot.
First assumption
Taking your text literally, @Alejandra Roman, I build the following:

If so, the following formula will calculate the sum of all five TBH* columns:
TBH1-5 =TBH1+{TBH2}+{TBH3}+{TBH4}+{TBH5}

But it will not calculate the sum of the costs associated with the employee salaries.
Second assumption
To get the costs based on fixed rates, you may want to expand the table as follows:

Those need not be hard-coded, you may get them from ancillary tables via Lookup(), TableMatch() or something like that.
Then we calculate the costs for each of the TBH columns:

And, at last, the Total Cost for TBH1-5:

Final comment
Cost Transparency will automatically aggregate all the line items related to a Cost Center if you have the data in the appropriate way. E.g.:

You could still keep the detail by job category if required:

Should any of these options not suit your purpose, just let me know the details and I'd write a more comprehensive blog post.
#ApptioforAll