are you talking about the test sample data ?

No, I am using joomla 4.0.0-alpha12 without install any data, I am using my data.

maybe i don't understand your request

In joomla-alpha12 Cassiopeia Default template there are no Top Position and Bottom position.
My request is :
1 : Add Top Position to Cassiopeia Default template.
2 : Add Bottom position to Cassiopeia Default template.

Could you provide a screenshot on which you mark where you expect these positions to be? Maybe there are already such positions but with a different name.

If I do not mistake, we have these

Top right

Bottom: maybe possible to add a position called footer-left

First :
This is Main Menu position and search position, Ok
I am talking about another new potions add up of Main menu position and search position.
Add new potions to Cassiopeia Default template for user menu (Login, Logout, User Profile ....et)

Second :
In the bottom of Cassiopeia Default template we have (Position: bottom-b) and (Position: footer).
I am saying to add another new potions after (Position: bottom-b) and before (Position: footer) it is between to used for (Terms Of Use, Privacy Policy ...et)

I can easily add a bottom-c position as proposed above, but I would not know how to add a header position on top of those existing.

@infograf768 please add a bottom-c position as proposed above,

@richard67 Do you know how to add a header position on top of those existing?

@richard67 Do you know how to add a header position on top of those existing?

No.

Closing as having a pull request. Please test #31731 . Thanks in advance.