To define a custom style in a word processing context means to define "a group of settings that I can apply at will to parts of the text". That is, I should be

To define a custom style in a word processing context means to define "a group of settings that I can apply at will to parts of the text". That is, I should be able to define a "Code block" style that should appear in the same dropdown where google docs lets you select heading levels. When I select that "Code block" style, the app should format the selected bit of text according to the syte's definition. For instance: use a monospace typeface, apply some margins to this paragraph and paint a gray background on it. Likewise, I should be able to update the style definition and all code blocks should update accordingly. This is very basic functionality that has existed in word processors since... forever. Large and/or more complex documents are simply much much more painful to maintain/evolve without this feature.