Sending Multiple items in a single case

Good morning,
I wonder if anyone can help please?
I am wanting to send multiple ASIN’s in one single case to Amazon. How would I go about packing them. Can I just put them all in the box toegther, or would it be best to put the seperate ASin’s in seperate boxes? Would I then have to put the ASIN number on each individual box?
Very new to sending to FBA . Any help would be great
Many thanks.