What does tourist line A and line B mean?

This is actually just a way to introduce routes to tourists. Like "first line" "second line". It is a label that distinguishes travel itineraries.

For example, Line A,

Line A: Four-day tour of Lijiang, Tiger Leaping Gorge, Shangri-La, Songzanlin Temple, Hiking Niru, Colorful Waterfalls

No. One day: Departing from Lijiang at 8:30 in the morning - looking at the first bay of the Yangtze River from a distance - hiking Tiger Leaping Gorge - Xiaozhongdian Ranch - Shangri-La (stay in a luxury business hotel), 200 kilometers drive; altitude 3200m

The next day : Shangri-La - Jiuqu Shibawan - Luoji - Pamunai Immortal Cave - Niru (accommodation in Pujian) 127 kilometers by car; altitude 2705m

Day 3: Niru Shang Village - Xiadiaoge Ranch - Colorful Waterfall - Diji Ranch - Shudu Lake - Shangri-La (stay in a luxury business hotel) The total hiking distance is 34 kilometers; it takes 9 hours of hiking. Altitude 3200m

Day 4: Shangri-La - Songzanlin Temple - Lashihai - Lijiang, 200 kilometers drive; altitude 2400m

★Itinerary cost: 1180 yuan per person for the whole journey.

★Includes fees: attraction tickets, accommodation, transportation, outdoor tour guide, and travel accident insurance.

★ Self-care expenses: Excluding meals (meal AA) and horse riding fees; Note: If you ride a horse to Pudacuo on the third day, it costs 150 yuan per horse.

★Note: The vehicle availability for this route is arranged based on the number of applicants: 6-9-seater commercial vehicles, 12-17-seater Ford Transit, and 19-seater King Long vehicles. The number of people in each group shall not exceed 14 people. Accommodation situation: Shangri-La arranges a luxury business hotel (24-hour air conditioning, free long-distance calls, free broadband Internet access) for two nights. Niru will stay in the Tibetan Common Room and receive a free Naxi-style meal on the return trip of this (Line A) line

Line B: Lijiang-Tiger Leaping Gorge-Shangri-La-Daocheng Yading-Shangri-La Ring Six-Day Tour

Day 1: Lijiang-The First Bend of the Yangtze River-Tiger Leaping Gorge-Shangri-La (180 kilometers);

The second day: Shangri-La - Daxue Mountain - Xiaoxue Mountain - Xiangcheng - Unnamed Snow Mountain - Sangdui - Daocheng (330 kilometers);

The third day: Daocheng - Riva - Aden - Longlong Dam - Chonggu Temple - Pearl Sea (120 kilometers);

Day 4: Aden - Longlong Dam - Chonggu Temple - Luorong Cow Farm - Milk Sea - Five Color Sea - Daocheng (120 kilometers) ;

Day 5: Daocheng-Sangdui-Unnamed Snow Mountain-Xiangcheng-Little Snow Mountain-Da Snow Mountain-Shangri-La (330 kilometers);

Day 6: Shangri-La-Songtsan Linsi-Lashihai-Lijiang (180 kilometers).

★Itinerary cost: The full cost is 1,880 yuan/person.

★Includes fees: attraction tickets, accommodation, transportation, outdoor tour guide, and travel accident insurance.

★Own expenses: Excludes meals (meal AA) and horse riding fees.

This should be the case. Route A shows that we are taking these scenic spots.

Route B shows that we are taking other scenic spots, and this is the specific meaning.

You can search the keyword "Lijiang Green Field Outdoor Club" on Baidu, which is also introduced here.