If you use a lot of Bryce primitives -- and who doesn't? -- rename them something meaningful with an exclamation in front of the name, for example, !sidewalk. The exclamation makes them sort to the top of the primitives list. Also, name groups in heirarchies with exclamations, with larger assemblies using more. For example, !sill would be part of !!window1; !!window1 and !frontstep would be part of !!!house. The number of exclamations doesn't have to be exact, but the larger assemblies sort to the top of the group list. This has saved what is left of my sanity many times. There is nothing more tedious than trying to find which cube between cube 1 and cube 345 is the one I want.