Final answer:
To add the same part number in separate line items, deselect the 'Sum Recommended Items Quantity' option and use a unique Identifier for each line item.
Step-by-step explanation:
To add the same part number twice to a configuration but in two separate line items, you should ensure that the configuration option 'Sum Recommended Items Quantity' is not selected and that the Identifier is set in the result statement. This will allow each part number to be treated as a distinct line item, even when the part number is identical, by giving each occurrence a unique Identifier. In contrast, if the 'Sum Recommended Items Quantity' were enabled, the system would aggregate quantities of the same part number into a single line item.