We need a total inventory / stock list from our three current warehouses. These warehouses supply their data through FTP as a TXT or CSV file. The script needs to display the per product stock for each warehouse and the totals. Matching products can be done based on SKU. Updating the stock can be done manually and or automatically every hour. We also need the possibility to save the data as CSV. Some warehouse files contain more products then the one we need to display so there must be some include or exclude.