Try just dragging them around to reorder them. If it doesn't let you then the later features may be referencing the earlier ones and so can't come first.
Sorry, I thought you were talking about reordering the features in the feature tree. If you are actually talking about moving the separate bodies then you can try Venkatesh's solution. You could also just extrude each one to a different depth so that the one you want in front sticks out the farthest, and the one in back sticks out the least amount.
I don't want to move any of the parts.
All 9 extrusions are sketched on the front part plane.
All 9 front part planes are coincident to the front assembly plane.
The parts are arbitrarily in front of or in back of others.
I want to have the parts appear so that the higher parts are in front of the next lower parts.
The photo in the top post shows how disordered they appear now.
Thanks for your replies.