Where to find total shipping charges we received from customers

Where to find total shipping charges we received from customers

Hi may be this is silly question but I am not accountant 
I am using Zoho for my small online business accounting and still learning

 when we create invoice we have shipping charges not as item but at the bottom of invoice .
in my business we collect shipping cost fom our customer so it comes  as money in flow 
but when we ship their product we pay shipping cost (the amount we collected from our customers) to our shipping partners.

now I have to file that shipping expense and I am looking for the way if I can find how much in total we received shipping charges from customer so same amount I can book as expense at the end of every month.
because right now that shipping we received from customer is showing as money in ......so amount show in profit but in reality we have paid those money as shipping. 
so it is not balancing my final report or balance sheet whatever you call it 
hope I can find some easy solution for that