Staging Environments as Sub domains

Hey guys, I have been searching for an answer for this and I haven’t been able to stumble onto anything as of yet.

I have a client who needs to have two staging environments. One can be locally but they would prefer it not to be. I figure if I can figure out how to do this with sub domains then it relatively should be easy. For ex: dev.clientsdomain.com > test.clientsdomain.com > clientsdomain.com

I tried to explain to them that they technically don’t need the two, they can easily make changes to the one staging environment and not publish them but they have their agents using the test environment to test out policies.

Now, I could easily figure out a way of doing this myself if I was maintaining the site, but they have an internal team that needs to easily be able to do this (WHERE’S THE EASY BUTTON?) I’ve been looking at plugins but most them put them in sub directories, not sub domains which is necessary per client.

Also, right now they are using a software called Beyond Compare to do this from local > staging > live and they compare files to see what has changed but since WordPress doesn’t have physical changes to the files and is all database, I am not sure this would work.

Life story over….Has anybody done this? Feedback and insight appreciated.

THANKS!