You can’t have Nightbot store data, when you input something it’s temporary, and if you edit another command with that data it overwrites the former content, so what you’re looking for isn’t natively possible.
You can however use the Quote API (please be aware there are restrictions), if you’re just looking into having a total, and then just various names with no details, you can use the $(count) variable along with the quote list, but if you’re looking for details in your output, I suggest adapting this command: