[Koha] Shelving location when entering an item.

Hello, We have recently installed Koha for evaluation purposes. At the moment, I am entering items into the catalog. When entering an item I would like to choose a shelving location that is not in the drop down box for c-Shelving location in the edit Item form. (I believe it is the MARC 952 c field). How would I add an item to that drop down list? Thank you very much, Michael Lasater ---------------------------------- Rolling Hills Consolidated Library 1912 N. Belt Highway St. Joseph, MO 64506