To edit within the context of an assembly, you must:

To edit within the context of an assembly in Siemens NX, making the part the work part is essential. The work part refers to the specific part or component that you are actively working on in the assembly environment. When a part is designated as the work part, it allows you to make modifications directly to that component while seeing its relationship with other parts in the assembly. This functionality is important for tasks such as creating, editing features, and managing constraints, as it ensures that any changes made are correctly integrated and reflect the assembly's overall structure.

In contrast, other choices involve different states or displays of the parts, but do not directly facilitate the active editing process. Simply changing the display or selecting the part through various menus doesn't enable you to modify it directly in the context of the assembly environment. Ensuring that the correct part is the work part is crucial for effective assembly design and management.