Doesn't seem like `...drawings\assets\schedule.css` overrides `...Blender Foundation\Blender\4.1\scripts\addons\blenderbim\bim\data\assets\schedule.css`

[theoryshaw]

I could be wrong but it doesn't seem like ...drawings\assets\schedule.css overrides ...Blender Foundation\Blender\4.1\scripts\addons\blenderbim\bim\data\assets\schedule.css

[Moult]

It doesn't. The CSS needs to be alongside your schedule file. This is documented currently in schedule.css:

/**
 * You may copy this `schedule.css` template alongside your input schedule
 * document with the same filename. For example if you have a schedule called
 * `door_types.ods`, you can create a `door_types.css` in the same folder to
 * style that schedule.
 */