How would I set a hierarchy in Sketchup?

Could you please elaborate more on this?

I am trying to make a custom ride that will be animated in a game and need help in creating pivot and rotational points.

This is the pivot point (red arrow) the bar has to pivot upward by 90 degrees like a lever.

This is the rotaional point (red arrow) the center hub is stationary and the vertical arm rotates:

How would I achieve setting the points?

How do you stop Sketchucation from downloading XML documents? It keeps doing this?

I use sketchup to create custom scenery for RCT3, and I can understand how bump maps would create a more realistic rendering of an item, what I'd like to know is if you are going to make something with a bump map (say as it was suggested with photoshop) why then would you need to take that bump mapped image and import it into sketchup at all.