How to calculate delivery, total cost and save the order in sale.order.ajax?

Question

1C-Bitrix

The sale.order.ajax component is used
There is a checkout
prntscr.com/f2szjw
When choosing an address on the map, we get the shipping cost, how to save this cost and recalculate the total cost of the order??
The difficulty is that I don’t understand where all the order data is stored, and how the order is stored in general.
The total cost should be calculated shipping + unloading + amount for the goods.
And they will be saved.