How to choose the city of Bitrix?

Question

1C-Bitrix

Hello. Please tell me how to implement the city selection functionality. For example: When you enter the site, a modal window appears, with select, and there in the option there will be two cities Moscow and St. Petersburg, when you select one option, the city is saved to the top of the site in header.php. At the same time, addresses and goods should change for the corresponding city, and when ordering, a label with the city, so that the manager understands from which city.
What can you advise? Are there any links to similar tasks, or a manual. Where to begin.
It is desirable that all this was in one domain, and not in one infoblock, so that it does not take up much memory.
I thought it might be better to create the properties LIST and the value Moscow with a checkbox, with the property set, the product was displayed. Thanks in advance.

Answer 1

There are various solutions https://marketplace.1c-bitrix.ru/search/?q=+%C2%FB...

Answer 2

Or here: marketplace.1c-bitrix.ru/solutions/twofingers.location