The Member Name column automatically generates unique names to distinguish each iPart member.
If you alter the member name from the default, it alters the file name.
In the right pane, right-click an attribute and select Key. Click the arrow and select the number to specify the order. For example, if you always select a part by its length, and then its width, designate length as Key1 and width as Key2.
Continue to add rows and columns as needed. Consider editing the table in a spreadsheet so that you can take advantage of functions such as copy and paste, formulas, and sorting.