Subitem resource tracking

I can’t tell if this is working or requested. BUT I need subitem hrs to track my people resources. I can add a number column to subitems and Mirror it to my main task but when I look at workload it still combines the hours and my only option is to have it summed or split. Many cases the task is 80% for on person but there are other resources/people assigned subtasks too. Is this on the list?