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An Onshape Assembly tab is where you define a hierarchical structure of part and subassembly instances of an Assembly. It is also where you define degrees of freedom and relations. You can have more than one Assembly tab in a document. One Assembly can instance another Assembly as a subassembly, and/or instance a part directly. You can instance parts from the same document or other documents to which you have permissions (and that are versioned).

For more Learning center resources about Assemblies, see: Self-Paced Courses > Assemblies (Onshape account required). You can also see the technical briefing article here: Defining High Performing Assemblies (Onshape account required).