One database for multiple domains

I am a little new to Virtualmin and i really like this piece of software...well done made, my compliments!

I have a, a ratter simple, question, i guess, but i don't know how to handle it.

I have a domain (shop) running with a database and that runs really smooth. Now i want to make more domains (shops) which uses the database of the first domain (for stock issues), but the original domain name must not been seen in the browser.

So lets say the first domain is www.shop1.com. Now i want to add www.shop2.com into virtualmin which uses the database of www.shop1.com. But when they go to www.shop2.com, the domain name must stay www.shop2.com.

Is there any simple instruction how to set this? All virtual servers gets their own ip.

Hopefully someone can point me to the right direction. I would be extremely thankful for it.