There are multiple reports that give you this kind of information in the business reports.

But you might want to explain what exactly it is that you are after.

Without knowing precisely what data and why you want it, you can try this as a start:

Go to Reports > Business Reports. Under “By ASIN” choose the bottom option “Detail page sales and traffic by child item”. You can change the date range at the top of that page, and download the data as a csv file

Going forwards you might want to keep a stock ledger spreadsheet