Import csv file data in their respective sheets

so i have a import system that i use to import 2 csv files. the first csv file containts 17 rows of (User data) and the other csv file contains 3896 rows of (Book data).i have 2 sheets where the data from those csv files had to be stored (USERS) and (BOOKS) currently you can import the user data or book data in any of those sheets, the thing im trying to achieve is that when you import let's say the book csv file you can only import the data into the BOOKS sheet not in the user sheet or any other sheet, the same applies for the User csv file. (Here is the import code im using it's a cutdown version from the full program, because the program is bigger then the limit)

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i have tried to find something similar on the internet but i didn't find any info . any help is appreciated, Thank you in advance!

You could look at the headers then decide and restrict the copying to the specific file..