how to make navision 2009 r2 enable to copy data from excel to navision



I am Using Navision 2009 r2 . i have lots of Item No. and Qty to invoice and every time i have to put item no. in sales line. i want copy data ( Item No. , Qty ) from Excel to Navision 2009R2. How can I enable Navision System to copy data from Excel to navision.