If paying both payroll and expenses for example using the employee card then the general journal takes the posting group set on the employee card and only 1 can be stored on the card.

To negate the need for 2 employee records per employee i.e. 1 for the expenses and 1 for payroll you have to change the Posting Group field when importing, this is only available when you import via configuration package.

The Posting Group filed on the General Journal should be available to add to the screen via personalise and also be there when you select Edit in Excel.