Copying wordpress site to other sub domains

I have my main wordpress site and I have also several subdomains under my main domain.

Now, on one of my subdomains I have created a new site which is completely different to my main site and I want to copy this site exactly and place it on my other sub domains.

How do I go about completing this task? Is there a plugin anyone can recommend?

Any advice would be greatly appreciated,

Thanks,
Will