In the ATSU AOC Preflight menu of an Airbus (maybe Boeing too), there is an option for a weight and balance request. The selection name varies by airline but it may say "W/B Req" "Send LoadSheet" "LoadSheet REQ & Confirm" "Weight Manifest Request" "Loadsheet Request" "Load Data Report" or "W/T Balance".
What does this page look like? What information does the pilot have to enter in this page?