The question here relates to where an organisation that might have more than one one legal entity in D365 F&O, e.g. relating to separate countries. Where the organisation has Projects into which more than one legal entity contribute or work on the same project, so the organisation needs to view, manage and report on that single global project.
So, the question is, within D365 F&O how do you define that 'single global project', what single unique identifier defines it as the ultimate parent, albeit that it may be that in each legal entity there may be one or many sub projects within a hierarchy. What pulls the Legal Entity project hierarchies together across the organisation?