Upload the monthly Artiklar export from the ERP. Najell-config stores unit cost per article (SKU), and the P&L uses it for exact COGS — falling back to the GM1 % only for articles not in the export.
Reads the Nr (article number) and Styckkostnad (unit cost, SEK) columns. Articles with a blank or zero cost are skipped — those fall back to the % in the P&L.