Hi Raymond,
I think that a few more details would be helpful.
In Word 2007, the Autotext feature from previous versions has become part of
the Building Blocks feature, which includes numerous galleries of building
blocks, one of which is called Quick Parts. There is also an Autotext
gallery, but I think that this gallery was included only to help users
familiar with this name from previous versions. There are many predefined
building blocks and you can add your own to any of the galleries, but only
you define the Quick Parts (or Autotext) entries. To define a Quick Parts (or
Autotext) entry, select what you just typed, and press Alt+F3, just as you
did in Word 2003 for Autotext entries. In the dialog box that opens, change
the name to something short and memorable, notice that the Gallery is set to
Quick Parts by default, and click OK. Before you click OK, you can change
Quick Parts to Autotext in the Gallery dropdown list. This change is not
necessary, and if you do make this change, your entry will not be displayed
in the list of Quick Parts that you can display by clicking Quick Parts in
the Text group of the Insert tab on the Ribbon.
Now, to insert your Quick Parts entry or any Building Block from any gallery
into a document, just type its name, and press F3 as you did for Autotext
entries in Word 2003.
You can manage all your building blocks in the Building Blocks Organizer. To
open it, click the little arrow on the Quick Parts button in the Text group
of the Insert tab on the Ribbon. This opens a list that includes the names
and content of the Quick Parts that you have defined (but not the building
blocks that you assign to the Autotext gallery) and an option to open the
Organizer.