Create a Custom Component Assembly you want to share, and in Edit Mode: Right-Click> Add to Library
Click to Select a Cross section to be added to the library, and give it a name:
Once created and added, you will see your custom in the Assembly list. This is only available in the current model.
To share this with between other Projects, or even other users:
1. Browse to C:\Users\<user>\Documents\Autodesk InfraWorks Models\<model.files>\unver\Content\Styles\Component\Custom
NOTE: This is the default project location where <user> is your computer name and <model.files> is the project with the custom assembly.
2. Copy the custom ACItem and PNG files from this location [these should match the custom you created]:
3. Paste these ACItem and PNG files to C:\ProgramData\Autodesk\InfraWorks 360\Resources\LocalLibrary\Styles\Component\Assembly [default location]
Once pasted, you will have access to this and any custom assemblies that have been copied over in all IW projects.
A big THANK YOU to Sean Hulbert for discovering this process!
Willy Campbell
