Looking for template for bulk upload

Looking for csv or excel templates for bulk upload. Need to create one for a b2b software with a few dev challenges to consider
Some fields has limited options (50+) for users to selected from,
Can’t listed them all in the form Can’t use …
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Expected behavior of "Apply default option to all" checkbox

Let’s say users are filling out a form; they can either manually select values, or use a checkbox to apply a set of default values. (We’ll call it Option A for the purposes of this question.)
What should happen in the following scenario:
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