If you own the main domain registration you can add it in side of Cloudflare dashboard and not create a record for the root of the domain but instead test.abc123.com
You can do this on a free Cloudflare plan.
If you need two different Cloudflare accounts and configurations for your root domain and subdomains you would need an enterprise plan:
Hi @dmartin1,
thanks for your response. I don’t own the main domain; it’s managed by our customer. We only have an “A name” record pointing to our server. Given this setup, can we manage the A record on Cloudflare without its main domain? Is there a way to do this on the free plan, or would we need to consider an enterprise plan?