How to integrate Barcode in Navision

Hi,
you have posted only general question, so answer is general too:
1. If you want to use Item No. identification (or any other information contained in sales line table) scanned as barcode by scanner attached by USB, you should nothing to do. If is the sales line too complex to maintain by staff, you can create simpler form/page to simplify data capture.
2. If the scanned information contains more then one information (e.g. ID and quantity), you have to split these information into appropriate fields. This "split code" can be written e.g in OnValidate trigger in sales line table.
3. Other situation (e.g. offline scanning) should be discussed and covered specically.