Scenario: I have some text (multiple paragraphs), using Normal style, and I changed paragraph and font attributes. (Example would be an "image/layout" of a placard, within a longer document, with some paragraphs now centered, some text bold, added tabs.

Is there a function in Word to lock that selection of text so it does not change if I modify the style?

The only solution I can think of is to create a new style (Never Modify) and if I am going to make formatting changes that I want to "fix" I use this new style (and never modify the style).