Organisational structure of projects

Hi,

I observed that WBS elements of different company codes can be created under a project.

So I wanted to know if there is any organizational structure for projects?

Is it that a project can be used in multiple company codes? across company codes?

For Example:

Company code in Project is 1000

WBS Element X under above project assigned to company code 1000

WBS Element Y under above project assigned to company code 2000

Regards,

SD