Order total – how to count?

Hello, I have a question, how to solve the lack of automatic order total? I’ve been having a lot of trouble since this feature disappeared. I prepare my file in csv, each order item is in a separate line, each item has a price. Until now, your import counted the total of the entire order based on the price from the file. Now it looks like in the CSV file I have to assign the total of the entire order to each line, which is quite cumbersome.
Do you have any tips on how to do this? Thank you very much ?