Can I install a new theme on a subdomain but have all orders/customers accessed from the same place?

[bdouglas73]

I'm looking to create a subdomain for all of our landing pages. We want to use a third-party page builder to create these landing pages. However, after reading some of the negative reviews about thousands of line of code being injected into the main theme (and sometimes not being removed after the app is uninstalled), I'd rather create a second website on a subdomain that uses a different theme so I can add the page builder app there. But we want all orders/customers to appear within the same admin interface. 

Is this possible? I've found similar, but different questions answered, but not this specific question. 

Thank you in advance.

[bdouglas73]

Any ideas community?