Help with using two websites under the same domain

Hello guys,

The title of this post isn’t clear but I couldn’t write it any clearer. Sorry.

Here’s my dilema. It’s actually simple to understand.

I have my main website under http://www.step1.com.br
This is a language school. The website is in Portuguese, and describes the 4 languages we offer to our local community: English, Spanih, French and German. That’s the easy part.

We also offer a 5th language, which is Portuguese for foreigners. And, nowadays, it’s located at http://www.step1.com.br/portuguese. This website is in English and has its own menu and everything. It’s like a separate website, but it is currently part os the root “www.step1.com.br”.

Here’s my question: since this “Portuguese Course Website” is very old, I need to updated it using Enfold. What do you think would make more sense: a) Keep using http://www.step1.com.br/portuguese or
b) Buy a new domain such as http://www.step1portuguese.com

If I keep using http://www.step1.com.br/portuguese, could I have a whole different menu system than the one I use on http://www.step1.com.br? Such as the one I currently have in http://www.step1.com.br/portuguese?

Many thanks for your help!

Miguel