Bottom up assembly strategy involves several components or sub systems being designed or re-designed and then packaged together to form an overall product.

Tutorial

Reference-Reference tutorial
Profile-Profile tutorial

Bottom up animations

Reference - Reference. This animation shows how to create an assembly using a reference from one part to create a feature within another part

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Profile - Profile. This animation shows the use of a profile or sketch from one part and sharing it for use in another

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This method can become increasingly complex when a large number of individual components contribute to the overall assembly. These tutorials therefore aim to show you how to establish the links and associations between parts that need to interact with each other and make the ‘management’ of design changes easier. Look at the profile -profile tutorial and reference - reference tutorial to give you an idea of how these parametric links can be made.