Another way of selecting objects, groups or meshes is to click on the small upside down triangle at the bottum right hand corner of your interface. A menu will appear with which will let you select by either groups, or individual meshes or objects. Alternatively, if it is a native bryce object you wish to select( terrain, sphere, ground or sky plane, meta balls etc) along the bottum toolbar there are tiny icons of each of these items. Simply click on one of those and a list will appear of all of these items you have in your scene. There is an option to select all of the any given item or they can be selected 1,2,3 at a time by shift clicking each one you want. This shift clicking works no matter where or what items, objects, or groups you want to select.