Start with your itinerary, stopovers included, then add who is travelling and why.
Start with your final destination. Then add layovers: before you arrive (outbound) or after you leave (return). A layover can be short (one day) or a long stay.
Final destination
Pick people from your traveller profile, or another traveller. If someone has several nationalities, pick the passport they travel on.
Nothing is stored for this check.