Layout-based Assembly Design
In layout-based assembly design, you can switch back and forth between top-down and bottom-up design methods. You can create, edit, and delete parts and blocks at any point in the design cycle without any history-based restrictions. This is particularly useful during the conceptual design process, when you frequently experiment with and make changes to the assembly structure and components.
To create a layout:
Open a new assembly.
In the Begin Assembly PropertyManager, click Create Layout.
A 3D sketch opens, and Layout appears in the FeatureManager design tree.
Create sketch entities and group related entities into blocks.
Close the blocks and the sketch.
You can create a layout in an existing assembly by clicking Create Layout (Layout Tools toolbar).
Make Part from Block
Virtual Components Overview