1
Onshape Documents are a powerful organizational tool. Think of Onshape Documents as containers for project-related data (Parts, Assemblies, Drawings, etc.). Consider limiting the number of Tabs in any one Document to 40 or fewer. As portions of your design mature, you can move those Tabs into their own Documents. Note that you can store non-CAD information, such as photos, videos or PDFs in a Document as well.
2
Interrelated Part Studios and Assemblies that are defined in the same Document will update automatically.