Manasir,
Are you trying to import multiple Sales Journal Batches or lines? In either case you can use RapidStart package to create in Excel and Import into the Sales Journal Template and related batch. Also, not sure if this is just a large Excel spreadsheet, but on the Sales Journal page, having the Excel spreadsheet open and the columns exactly the way your journal looks, you can copy/paste them from Excel to the Journal.
Hope this is what you are trying to accomplish. If not, please explain more so I can reply back.
Thanks,
Steve