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When i'm creating new page and trying to give the same title and menu text as the page i created before i recived:
Alias has already been used on another page
i would like to have structure:
4 Hazetta
4.1 -  Nr 23
4.1.1 -  -  Str 2-3
4.1.2 -  -  Str 4
4.2 -  Nr 21
4.2.1 -  -  Str 2
4.2.2 -  -  Str 3
4.2.3 -  -  Str 4
4.3 -  Nr 20
4.3.1 -  -  Str 2
4.3.2 -  -  Str 3
4.3.3 -  -  Str 4
So page aliases Str 4 are the same.
The solution is- create page with different alias e.g. "blabla" and then rename it to demanded i.e. "Str 4".
QUESTION IS:
Is this solution has any unpredictible for me results?

2 Secon problem is that when i first time name page "blabla" and then rename it to "home" for example then i can't use name "blabla" again. its not possible to reuse that particular name.

alias name must be unique.

on similar cases Ive used some prefix for aliases like

1. something
1.1 something_info
2. else
2.1 else_info
3. more
3.1 more_info

when all of those parents would have page named "info"