How to transfer a site to DLE from categories to subdomains?

Question

DLE

There is a site on DLE with services in cities. Cities are made as sections. There is a task to transfer the site to subdomains so that each city is on a separate subdomain.
Now it's like this: site.ru/ivanovo/remont-moto/
You need it like this: ivanovo.site.ru/remont-moto/

Maybe there is some module to implement the task, or at least how to organize such logic for a programmer, how difficult is it?