Short title

When a short title is needed, EndNote includes the subtitle. Is there an option to not include the short title or is the only route to enter the short title i want to appear in the Short Title field for each record? 

For example the first time a citation appears it reads as: Van Nam Kim and Jürgen Moltmann, A Church of Hope : A Study of the Eschatological Ecclesiology of Jürgen Moltmann (Lanham Md.: University Press of America, 2005).

When repeated it reads as Kim and Moltmann, A Church of Hope : A Study of the Eschatological Ecclesiology of Jürgen Moltmann.

I want it to read as_:_ Kim and Moltmann, A Church of Hope.

Using EndNote X3, Chicago 15th A

If the short title isn’t defined somewhere in a field, how will endnote know what to use as the shorter title?