How do I sell seats from availability in Amadeus?

When

You have the availability on screen and the client chose a flight and class.

#	Entry	What it does	Why
1	`AN20OCTLJUFRA`	Shows availability.	The line numbers you sell from.
2	`SS1Y2`	Sells 1 seat in class Y on line 2.	Seats × class × line.
3	`SS2CB1`	2 seats on line 1: first flight C, the connection B.	Different classes on a connection.
4	`SS1Y2*11`	From a round-trip display: line 2 out and line 11 back, class Y.	Both directions at once.
5	`SS3L2/P1,4-6`	Sells for passengers 1 and 4-6 only (names already in the PNR).	Part of the party.
6	`RTA`	Shows the sold segments.	Check the class, times and the status the airline returned.

The PNR shows the segment(s) with the class and the number of seats; after ER, status HK.

Seats = adults + children. A lap infant takes no seat.
On a connection, sell both flights in one entry — selling legs separately can break married segments and the connection's availability (see Married segments — why you cannot change one leg alone).
If the answer is "NOT AVAILABLE BUT WAITLIST OPEN", the class is full — sell another class or waitlist on purpose (Waitlisting a full class, and what happens next).
Selling holds a real seat once you end the PNR; only IG releases it before.