Multiple URL's for one website

I have my primary website (my name - missybane.com).  

I have a second URL (my brand, not my name - beyourmd.com).  So, subdomain will not work, right?  I don't want it to be beyourmd.missybane.com, I want www.beyourmd.com.

I want to create a page on my primary that is home to the second URL.  So, instead of creating a second, separate website can I give a page on my site a separate URL.  If someone types in www.beyourmd.com it dumps them on a page on missybane.com.

Is this possible?  Thanks so much!!!!!

Squarespace domains work so that you have a primary domain. This domain name is the one that appears in the browser address bar. 

Other linked domains effectively act as pointers to the primary,

To do the type of forwarding you're asking about you would need to set up external DNS rules on the beyondyourmd,com DNS control panel. However, this would resolve to the missybane.com domain in the address bar. 

Thanks Colin -

Quote

you would need to set up external DNS rules on the beyondyourmd,com DNS control panel

Even if I purchased the domain thru SS?

If the domains are purchased from Squarespace I suggest you contact Squarespace Support. They will be able to explain your options.