Business Unit
The business unit that you specify on the spreadsheet journal header is defaulted to those spreadsheet lines for which you have left the business Unit blank when you import the spreadsheet.
However, just as with Ledger, SpeedType, and ChartFields, if you select the check box that is located below the Unit field on the spreadsheet lines page, the system copies the business unit to the next line that you entered on the previous spreadsheet line. In other words, if the copy down check box is selected for Unit, the system automatically copies the business unit from the previous line instead of defaulting the business unit entered on the spreadsheet journal header to the new line that you are adding.
In either instance you can manually add and change the business unit on spreadsheet lines.