Top Down Assembly Modeling | Click by click

Top Down Assembly Modeling is what you'll want to understand right after Bottom-up assembly in whichever CAD program you're using.
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This 5th intermediate tutorial shows you the basics of the Top-down method, otherwise known as "In-context design" one click after another and we're using Fusion 360 here.
You’ll want to work through the previous tutorials, especially the one before this - Bottom up Assembly. The bottom-up method is when you assemble separate parts that have been modeled at an earlier time. The top-down method is where you create or modify parts within the context of the existing assembly, or (as is the case in the example here in this video), just one existing part and everything else in the assembly is designed and created within the assembly while referencing its features.

If you haven't done the 16 Basic Tutorials you should start at the beginning:- Beginners Tutorial #1 of 16    • Learn Fusion 360 in a few hours. Part 1  

See:- The Intermediate Playlist    • Intermediate Fusion 360 Tutorials  

Chapters
0:00 Introduction
0:34 Review
1:13 Preparation
1:45 Initial component
2:47 Master sketch
6:35 2nd component
8:30 SMOKO
9:20 3rd - Shaft
10:28 4th - Drive wheel
12:16 Hand crank
13:46 5th - Key
14:53 Navigating the assembly
15:23 Joints
18:31 Contact sets
19:02 Animate model
19:25 Rename linked part