Bind to Space Warp 
Main toolbar > Bind to Space Warp
Use the Bind to Space Warp button to attach the current selection to a space warp or vice versa.
To bind the current selection to a space warp:
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Select an object
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Click Bind to Space Warp.
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Drag a line from the selected object to the space warp object. You can also press H to select the space warp by name.
The space warp object flashes for a moment to show that the bind was successful.