Merging Two Websites – Subdomains?

Hello everyone,

I am wondering if someone can help me find some clarity on the best thing I should be doing in regards to my two different domains.

I have a parked domain meganhallman.com

I have a live website on the domain muditametta.com

What I am hoping to do, is create a few pages on my current website for meganhallman.com, such as an about me, sales page, testimonials, shop (which would connect to my current homepage) and work with me. I would like when you type in meganhallman.com for it to go (point) to a separate page than my regular homepage.

The reason I would like them to be joined is because I want the same template and everything that I already have, it just seems to make sense to put it all together.

Anyone have any idea of the best, easiest thing to do?

Thanks!

Megan