Category and subdomain

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Hello,

I have two categories, in Pages or in the Forums, no matter.

For instance :

• www.mydomain.com/psychology
• www.mydomain.com/geography

And I'd like to display these categories with these urls :

• www.psychology.mydomain.com
• www.geography.mydomain.com

Is it possible to do that, in an easy way ?

 

Regards