There are three tabs to use when adding the parts that were used to make the piece. The list of parts is sorted depending on the tab you select. In the first tab the parts are sorting by Category/Partname. In the second tab parts are sorted by PartID and in the third tab by Vendor Item/Style#.
Click on the tab and click on the Add Part command button or the drop-down box to open the list of parts with pictures.
You may search for an item by typing the first letter or number of the part and/or scroll through the list.