2D Animation in Bryce

Hi not sure this is a good idea for a blog entry but it's the only way I can think to get fast attention to a question in relation to the software.

Years ago I discovered thanks to Bryce being able to import 2D images, the software was capable of making 2D cartoons was well as the normally thought of 3D ones. The trick is getting that 2D image not to move in any directions but up & down and left to right. Up and down isn't hard to do. How ever left and right without making the image swing oddly due to the 3D environment is the hard one. Years ago I knew how to do this trick but have since forgotten it. I'd greatly appreciate some one pointing out how to swing a 2D object on an axis with a fixed point at the top or bottom, that could for the rest of it move side ways.

I'm planning on making a cartoon series and have had no luck finding a 2D animation program that I can easily work with without bugs. Bryce may not be known for 2D but it is possible.