It is about four small boxes in a large box, should l how to label about Amazon FBA ?

Product label:  stick on the outside of each product

Outer box label: stick on the large box outside

If four small boxes with only four products and four SKU (SKU is abbreviated form of stock keeping
 unit, the small boxes are labeled with SKU bar-codes and the outer boxes are labeled with FBA bar-codes.

Size requirements of Amazon FBA label

This size is suitable for playing the outer box for FBA label sticker A4 printing label 210*297mm. FBA
tags can be enlarged, you should pay attention to the moderate.