Edit Deformers > Wire > Add Holder

Lets you add the selected curve as a holder to the current wire deformer. See Holders and Limiting the wire deformation region.

Edit Deformers > Wire > Add Holder >

Lets you specify the name of the wire deformer to which you want to add the current curve as a holder.

Specify Node: Turns on the Wire Node field and Existing Node drop-down menu.
Wire Node: Specifies the name of the wire deformer. Also, if you select the wire deformer’s name from the Existing Node drop-down menu, the name of the deformer you select appears in this field.
Existing Node: Lists the current wire deformers in your scene. The name of the wire deformer you select from this list appears in the Wire Node field.