I am having trouble producing a castellated beam in Revit 2013. When I load the castellated beam family it gives me three options and none of these are the one I want. when I duplicate and try to 'edit type' I can't get it to give me what i need.

The beam I'm trying to produce is a 915x229x113 castellated beam which is produced from the original beam of size 610x229x113.

Any help would be appreciated on this?

Michael