Multistore subdomain not working

[Breno!]

Hi,

I active multistore in prestashop 1.7.6.4.

I want use with subdomain. I did this:

main store: hfrural.com

store 1: jundiai.hfrural.com

store 2: ribeirao-preto.hfrural.com

I imported all data from hfrural.com, but when i try to acess store 1 and store 2 urls, message: ip not found in server.

I´m not create subdomain in my hosting, according the instructions in prestashop.

What can i do?

Thanks