You can access the Scene Assembly menu from the Outliner or the scene view. The options available depend on whether you have a scene assembly node selected in the Outliner.
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Turn on Asset centric selection in the Preferences window. See Selection preferences.
Selecting the representation selects its assemblyReference node.
-click the representation and select Select Assembly from the menu that appears.
The representation's assemblyReference node is selected.
You can now access the Scene Assembly menu by right-clicking the representation and selecting it from the menu that appears.
- Right-click an empty area in the Outliner to access the Create Assembly Reference and Create Assembly Definition commands.
- Select a Scene Assembly node, then right-click in the Outliner or scene view to access the node options in the Scene Assembly menu.
Scene Assembly > Create Assembly Reference
Creates an assemblyReference node.
Scene Assembly > Create Assembly Definition
Creates an assemblyDefinition node.
Scene Assembly > Create Assembly Definition >
Assembly Representations
- Add Locator representation
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Adds a Locator representation to the new assembly definition. Add Locator representation is on by default.
To access the following Scene Assembly menu items, select an assemblyReference or assemblyDefinition node, then right-click in the Outliner or scene view. Select Scene Assembly from the menu that appears.
- Locator
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Switches from any other active representation to the Locator representation.
If the assemblyDefinition node contains other representations, such as a Cache representation or Scene representation, options to switch between, these representations appear in the menu.
- Unload Active Representation
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Removes the current object displayed as a representation from the scene view, and sets the Active Representation to None. See Unload active assembly representations.
- List Edits
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Displays a list of edits to the representation of a nested assembly reference node. See List Assembly Edits window.
Scene assembly edits are managed by the assembly reference nodes. See Scene assembly edits.
Add Cache representation, Add Locator representation, Add Scene representation
Adds the specified representation type to the selected assemblyDefinition node. See Add assembly representations.
Add Cache representation >
/ Add Locator representation > 
Load Options
- Load representation
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Makes the new representation active as you load it.