New to CS5 Premiere pro, im trying to render certain sections of my timeline without rendering the whole timeline, in Avid you would just mark in and mark out the area you wanted to render, is there something similar to that or do you always have to render the whole timeline?
In CS6 you can do it the way you are used to.
In CS5 at the top of the timeline are Work Area markers that allow you to define a range to be affected by a process. You slide them to mark that area.
Place Work Area Bar over the part of the timeline you want to render and then hit Sequence/Render Whole Work Area.
If you mean Export also place work area bar over section and make sure in the export settings, Source Range (bottom left) is set to Work Area.
Why do you mention CS6 when the question was about CS5, which is a different product. I find this site very UNhelpful.