Spines are used in CAT to connect two hubs together. Spines provide special features that speed up your workflow, enable sharing of animation data among a diverse range of rigs, and allow sophisticated IK tools.
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Select or add a hub object >
Modify panel > Hub Setup rollout > Add Spine
Procedure
To create a spine:
Select a hub to which to attach the spine. - Do either of the following:
- On the Modify panel
Hub Setup rollout, click the Add Spine button. 
- In the viewport, right-click the hub and from the lower-left quadrant of the quad menu, choose Add Spine.
- On the