Multiple projects for each part of project

Hi any help appreciated with this.

 

I changed projects and my predecessor to my role has created a project for each major part of the WBS instead of an overall project.

 

Obviously there linked between and I can open all at once but are there any differences or anything I need to watch out for dealing with this multi project for 1 project?

 

an advised way of putting all into 1 would be appreciated, I was going to create a new one, create a wbs and open all in 1 then move out of each project into new wbs.

 

any comments appreciated