Good morning, Yevgeniy,
This is an old thread, and it's in the "Wishes Granted" forum. That's because we actually do have a "subordinate login" and have had since 2016. You can find Ken's announcement explaining it at this link. The "Help" for it is here, and you'll find the sub login itself in Site Central, here...
I'd be very cautious about this:
The more someone can outsource, the more websites person can build
- it isn't what we'd advocate if you're serious about building an online business
(as opposed to just a website). Outsourcing certain aspects can certainly be very useful - I employ a VA to do just that - but the core of the business, its heart and its voice, is each of us.
Certainly a website can be built in minutes. But a successful online business takes time and, as SBI! often says, "BAM".
Good luck with your online journey.