Game concept
Sell Titles Decision
The game also links it as Sell Titles.
From the game's encyclopedia
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Sell Titles Decision is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Decision allowing for the sale of trivial titles — titles of a purely symbolic importance." It is part of Decision. The game also links it as Sell Titles. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
for a guide, post or blog
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.