Subdomain redirection for CPA

Is it possible to redirect a subdomain to an affiliate/CPA offer landing page? Or this is just possible for the main domain?

I ask this for having to avoid purchasing a domain for every CPA offer I will promote.

Or, is there an easier way to do it when working with WordPress?

Cheers!

Yes you can redirect each subdomain to any url you want. I am not sure how this can be done via WP but you can do this easy through cpanel.