These commands are displayed only if a text layer is present.
In the Text to Selection drop-down list, the commands are identical to those of the Transparency sub-menu (in fact, the text is formed of areas of different transparency):
Text to Selection: Sección 7.37, “Alfa a selección”
Add to Selection: Sección 7.38, “Añadir canal alfa a selección”
Subtract from Selection: Sección 7.39, “Sustraer de selección”
Intersect with Selection: Sección 7.40, “Intersectar canal alfa con la selección”