Use Dummy IP in Cloudflare and redirect all request to real IP?

Hello, I need to set up a server, which IP will be inserted in Cloudflare, and all the request will be sent thru that IP to the main server, can this be achieved? I have a site which barely receives any abuse at all, (1 in past 2yrs) and the server was shutdown due to that abuse, now i have another VPS which is not giving me problem with abuses, so i wanted to use that VPS IP in cloudflare instead of the real IP, can i do this in anyway? A guide or anything? Thank you. Also, there are multiple domains, so i want an easy quick fix, like a simple forwarder instead of adding multiple domains in setting.