Attendees can also be imported from a previous expense line:

Click the Import button. This will bring up a second window.
Select the Expense Report that contains the line with the attendees to import.
1. It will default to the report you are currently working on.
2. If the attendees are being imported from a different report, you have the option to preview the report. Click on Preview.
Select the Expense Line from which to import the attendees.
Click the Import button.
Once the list is imported into the current expense line, the list can be modified to Add/Delete the records from the list as needed.
Click Apply Changes.

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