I work in the field of CS, and recently published one of my works (Algorithm A) in arXiv (not peer-reviewed), as a short technical report which introduces a new method along with relevant mathematical analysis/proofs/etc.
I want to submit a paper-X to a conference by using that method in some practical applications and in combination with other methods. I decided to not introduce Algorithm A in that work due to space limits and enough contributions that paper-X has by itself.
But i want to also submit an extended version of paper-X to a journal along with introducing Algorithm A with proper further analysis/proofs.
1- Is this allowed?
2- Is it convenient / advised?