You will need the following:
Live transactions on your Event - we import barcodes onto tickets, not seats. This means that there must be transactions otherwise the system doesn't know what to import to.
A CSV file of barcodes - to upload onto tickets. This should contain the following:
Barcode numbers
Performance dates
Line-Up performance IDs
Any seat information
You can download our CSV template on the Barcodes page before uploading.