Learn how to edit an external component in context of the parent design in Fusion.
To insert an external component into your design, navigate to a component in the Data Panel, right-click and select Insert into Current Design.
In the Browser, hover over the external component you want to edit, then click Edit In Place
.

Optional: In the Edit In Place menu at the top of the Canvas, adjust associativity:
Associative
Non-Associative

Make non-associative changes to the component.
To create an Assembly Reference, reference geometry from the inactive components in the parent design:
Edges, faces, and points
Dimensions and constraints
Position
Projection
Termination
On the Edit In Place menu, click Finish Edit In Place
to return to the parent design.

Save your changes.
If you made an associative edit, a reference is displays in the Assembly Reference folder in the design's Browser.