Running a multi-storefront online store with same Shopify account

[howlythk]

Hello Everyone

I am referencing the Gap's website (https://www.gap.com/?ssiteID=BR), they have 5 brands sharing the same "gap.com" domain and shopping cart, but with 5 unique layout and content under each of their brands (https://oldnavy.gap.com/?ssiteID=GAP, https://bananarepublic.gap.com/?ssiteID=ON, https://athleta.gap.com/?ssiteID=BR, https://hillcity.gap.com/?ssiteID=AT). 

I want to have a similar function on my website, that two unique storefont sharing the same domain and shopping cart + checkout.

I had a chat with the Shopify CS, and they said technically it is possible if we have a theme that allows us to have completely different layout on different URLs.

Has anyone have any experience doing this? 

I think there is not existing themes supporting this function, does anyone know if any of the Shopify experts or theme designers are able to create a theme for this?

Thanks!