Wondering If Book Chapters Can Be Submitted In Challenges At The Same Time....

Good day to anyone reading this:

I set up a Prose book for my short stories in order to collect the overall narrative I am working on in one place (https://theprose.com/book/3184/the-ultimate-hero-network-a-short-story-collection). I have been reposting stories that were previously submitted in challenges into the book. For future reference, I was wondering if there was a way to submit work in a Prose book as a new chapter, and also submit it in challenges at the same time. If anyone knows how to do this, please comment and help a dude that loves technology but is kind of awful with it at the same time. Thank you for anyone that can help, I really appreciate it. Regardless, I hope you all have a great rest of the day!