Can not solve the problem in Pivot Table.|Power Pivot|Excel Forum|My Online Training Hub

Hello,rnI dont know much about Pivot Tables and I have started to create one that I need. I have in columns: name od town, in rows time, and type od costs, and in values- costs.rnSo, I have put subtotals for time, by adding subtotal with right click. rnThis is the problem: I want to have average costs  - (costs/number of employees). When I put new field in Pivot it nicely divedies cost with number of empoyees. But in the cell where I want divedied subtotal with number of employees it just makes sum of calculations on the column.  How can I solve that?