Wanr to edit text boxes in more than 500 normal pages without overriding method inDesign

Since your base layout is on the parent pages, you can select all the (desired) pages in the Page panel and then use the panel’s menu to Override All Parent Page Items to unlock them for page-by-page editing. 

If you want to keep some items from the parent pages locked, put those items on a separate layer and lock the layer. 

Use paragraph and character styles in Word and match them up to the InDesign styles. It’s easier if they have the same name, but not necessary. You can save the style match-up settings for future use. You get to those options by Shift-clicking the open button when placing the text (don’t paste).

Another option is to use the Word styles as mentioned. Put all the entries in one document with page breaks between each entry in Word. Set up InDesign using the Primary Text frame. (You don’t have to override them.) Import the text, matching the styles and make sure you maintain page breaks. The layouts should flow automatically.

You should be able to set up that layout using just paragraph formatting.

Then you could use the formats from the Word document (they are properly formatted, right?) and map them to the InDesign formats. And then this could even be automized.