Top down modeling in Fusion 360 has many advantages.
- The assembly components are modeled associative to other components so changes to one updates related components.
- Components can use sketches and features from other components similar to using the derived process of modeling
- Components are normally modeled "in place" allow the use of As-Built Joints to join them together.
- Designs are easier to visualize since components are modeling in direct relationship to other components.
In this video I created a lidded box with seal using top down modeling which I hope to demonstrate this effective modeling method.
NOTE: This modeling method is not available to Fusion 360 Personal License users since the Edit in Place functionality is not present.