How to Assign CBUSH CID With Coincident GA and GB

The Optistruct manual says that when defining a CBUSH element with coincident GA and GB one must specify a CID. (Optistruct manual, CBUSH page, Comment 5)

I do not see a way of specifying a CID in HM. Editing the element has the fields for X1, X2, X3, but the there is no field 9 for the CID.

How can assigning a CID to a CBUSH be done?

Thank you.

Phil