When adding nodes to an asset using the Outliner, Maya respects the current Add to Asset options. For more information, see Assets > Add to asset.
The node is added to the asset. If the node was already inside another asset, it is removed from that asset.
The above methods are useful if you want to manually specify the nodes to add to the asset. However, you can also quickly add a group of nodes that are related by their hierarchy or connections.
To add a group of related nodes to an asset