I install odoo. Turn on website builder. In website I se name of default company - YouCompany. Ok.  I turn on multisite.

And after add one more company - MyCompany.  Today I have 2 companies.  I want use website for MyCompany - how I can do it?

Or can I use two sites - for any company?

How I can setting 2 shop -  one for YouCompany  and one for MyCompany?

Warehouses and shops setting and use - where I can read?