Can I book a large group of passengers on the same flight through my portal?

No, not in the normal way you would book a family or a couple of colleagues. Airlines treat a large party as a group booking, and group fares are quoted by the airline group desk rather than sold from the same live seat availability a portal searches. If you try to put a big party through an ordinary flight search, the portal will usually stop you at a limit set by the airline or the supplier, or it will split the party across different fares at different prices.

What your portal handles well is everything under that limit. Small parties, families with children and infants, and a mix of passenger types can normally go through as one booking, on one reference, with one payment, and the names all sit together so seating and baggage stay tied to the same record. Where the exact cut off falls depends on the airline and on the supplier your portal is connected to, so it is not the same number everywhere.

For anything larger, the usual practice is to contact the airline or your consolidator for a group quote, hold the seats under their group terms, and then record the booking in your portal so it appears in your sales and your customer history alongside everything else. Some suppliers can load a confirmed group booking back for you, and some cannot, so this part depends on who you buy from.

If you regularly handle large parties, ask your flight supplier how they want group requests raised and how the finished booking should be recorded on your side.