i have the following scenario: multiple projects are running under a master project. each sub-project has several phases (ex. foundation, form-work,reinforcement, piping, electrical ..etc). each sub-project will be handled by different project manager. for example electrical engineer will look after all electrical installations in different projects. he should be able to edit and assign tasks under electrical phase. how ever, i need to restrict him from viewing any data or tasks under other phases. all in all, i need him to just see electrical phase of all sub-projects. is this possible in any ms project old or new versions like 2013 or 365??