If you put all of the orders you want to see the cost for into a batch, then process the batch, you will get to a summary screen right before you actually create/ship the orders that shows the total package cost.
You can then choose to go ahead and create the labels or X out of the window and adjust your orders as needed.
Hope this helps!
hi @MCARBO-Don thanks for the quick response. I'm actually looking for it in the API endpoint. I don't see an appropriate corresponding field when I use the get order json body found at this link