Duct elevation questions

[Siberian]

So I've started looking at Revit MEP, and to begin with I have these questions;

 

Let's say I have a horizontal duct at a spesific elevation. I then run the duct-command and attempt to snap to the end of my excisting duct to continue. How can I make my new run match the excisting elevation? By default it doesn't.

 

I have a vertical duct (or pipe). What's the easiest way to modify it's elevation at either end? When I select it I'm only able to change the offset, but not the end offset.

[Methuselah]

Hit the space bar after you've clicked on the end of the duct.

 

For a vertical pipe, you can adjust the end offset. In other words, you can't modify it's origin point, but you can change how high it goes. I typically draw all of my pipe in a 3D view. This works great for Waste/Vent Risers.