sorry for the typo thanks for pointing it out.
Hello
I know my way of getting what I wanted to create may not have been ideal
I have a sphere/imitating our globe where people can walk up through very tight spiral stairs
Then they get to small auditorium like at medical university to sit and watch
I need to make an opening for them to be able to walk up without hitting their avatar head
as they can’t walk through floors and walls.
How can I choose all the components and explode them
I used a system of cubes that I rotated like an array to get to the look
I only need half of the circular floor to be open as there will be balustrades to frame all the rest.
I took me quite some time to create this space that’s inside a rocket and the globe is the top like of a spaceX head 
Thank you.
edit/ I add the look of where all this is happening inside so that’s why I am a bit concerned
of it affecting the globe although the inside structure is not part of it.