About Editing Xref Components and Folders, In-Place (AutoCAD Mechanical Toolset)

You can edit the contents of external reference (xref) component views and folders, in-place.

Changes are propagated to all drawing files that contain instances of the xref component or folder. While this is a convenient feature, it also means that if you modify an xref component or folder inadvertently, the mistake is propagated to all drawing files that contain instances of the component or folder. To minimize this risk, you must do one of the following before you edit the contents of an xref component view or folder.

Locked source files remain locked until you “purge” all locks or until you close the current drawing.