Do a google search for 'Bryce Easter Eggs'. There should be a list of keyboard shortcuts that will be helpful for you.  They are not listed in the manual.  The list was made a while ago, but i think most of them still work.

I also believe there is a short tutorial about linking pistons and wheels.  Maybe at  DAZ.

There are many cool things that can be done with linking in Bryce.  You can also do searches for 'linking in bryce" or some variation.