Adds the selected node(s) to the selected asset. If two assets are selected, then the asset selected first is added to the
            asset selected second. 
         
         Note 
               Maya returns an error if more than two assets are selected.
 
             
         Assets >  > 
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                     In addition to the selected nodes, any nodes connected via incoming or outgoing connections are also added to the selected
                        asset.
                      
 
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                     In addition to the selected nodes, any connected shader nodes are also added to the selected asset.
                      
 
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                     In addition to the selected node, adds other nodes in the hierarchy based on the selected option.