'supplier inventory' needs to be the main column where stock and orders are processed from! 'inventory' collum is obsolete for FTP feed

FTP feed gives stock quantities to the 'supplier inventory' column, the 'inventory' column is used to mark orders to be picked but is not linked to the FTP feed, as we are the supplier we would like all of the stock and orders to be processed through the 'supplier inventory' column so that the stock quantities are all correct for the orders to be marked as 'complete ready to pick' and not 'pending awaiting all stock' because they are linked to the 'inventory' column and wont be marked to be picked as the field is zero!