In the frame Paths a template file must be used.
This is an Excel file that is prepared for the part list export.

The ProSteelTools include of a sample template file: SinglePartList_Template.xlsx

This file can be edited freely.
Inserting data by ProSteelTools is done by cell addresses for header cells and start cell of table content.
The row for single parts should be there as a single row. This one will be copied for each exported part.
This way the sum row is any time at the end of the table.
For the table content it is recommended to set up number format and decimal places.
The sum formulas will be inserted by ProSteelTools as set up in the dialog.