In the navigation bar on the left-hand side of the "Open" and "Save As" dialog boxes there are options like My Recent Documents, My Documents, Desktop etc. This is convenient for when you open the same files over and over. Here's how to add one of your frequently used folders without having to navigate all over your network to find it.
Go to "Open" or "Save As". In this example, I want to add the folder called "Reports" I use this reports folder a LOT (which contains subfolders)
In order to add this "Reports" folder to the side bar, just right click anywhere in the side bar, choose "Add" (the name of your folder will appear, in this case its called "Reports").
My "Reports" folder will now be in my side bar for easier access.
Now I can open and save as with just one click.