How to fill Coal hoppers

Robert2d6

Cab Driver
If I am making up a consist for a session with multiple coal hoppers, how can I fill them up and save them as filled And if there is a way to do this, do I have to do them one at a time or can they be done all at once?
 
I just tried to save to a coal consist after placing the empties and filling them with coal, use the "apply to same cars in consist" button when filling, but I wasn't able to save the consist as full. When I saved and tried to place it elsewhere, it reverted back to empty cars.
 
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