Does anyone know the explanation of ticket positioning?

Positioning is: SD+ flight serial number+cabin code/number of people.

Then: NM 1 name (in case of multiple people, each name is preceded by the number 1).

SSR FOID airline code HK/NI id number (for the first person /P 1 for the second person /P2 and so on).

Contact telephone number

TKTL time limit/date/office number (for example: tktl210012mar/bjs407, note: the time limit should be set before the flight takes off).

Finally, the seal is worn.

After wearing it, you will be issued a five-letter or digital record number, which is your reserved seat.