Just had rock maple stairs installed, the installer helper did not know how to use an orbital sander and put some divots into the maple, did not see them until the stain an lacquer went down.

Do I need to sand theses out and refinish the entire floor or just the area the has the shallow divot? Another though was to spray coats of lacquer and block sand until I fill the void, then put poly down. Other suggestions.
Thx

Likely you'll need to resand. Spot sanding will be tough depending on where the marks are in the floor and staining after finish has been applied can leave a darker ring where the finish gets feathered into because it is roughened up enough to hold onto the pigment from the stain.

Problem with the other method is, those marks will always be there, even if the "dip" is filled in, you'll see the difference in the right lighting anyway. Besides, the effort required to fill in the dips would be the equivalent to fixing it the right way when it's all said and done.

Better to tough it out and go through the process again and not regret the end result of your floor if you have the time and patience to deal with it.

Rookies and veterans make mistakes, it's how we learn, but you need to correct your mistakes the right way to learn the lesson.

The best way to get rid of these marks is to sand with the next grit up. If I started with 40 grit sandpaper, then I'd want to sand again with 60 grit sandpaper. Then 80. Then 120.
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The best way to find and remove sanding marks is at the time the floor is stained.
If a natural finish is applied, then after the first coat of seal. This is the time to scrape, or sand the problem with a machine. The minor touch-up can be accomplished before the final coat of finish.