Update multiple tracking numbers for one order (fulfillment)
You can update multiple tracking numbers for an order in the following two ways.
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Upload a CSV with multiple rows for one order
CSV file (set a 4-line tracking number for order #1125)
The preview in the “Update tracking” tab (4 lines of tracking numbers for order #1515) -
Enter multiple tracking numbers separated by ”,”
CSV file (set tracking numbers separated by ”,” for order #1125)
The preview in the “Update tracking” tab (tracking numbers separated by ”,” are shown together in one row)
Press the “Update tracking numbers (n)” button at the bottom of the screen, and press “Update” in the confirmation modal “Update tracking numbers?” to update the multiple tracking numbers.

Overwrite the tracking numbers of already-applied orders
To apply a different tracking number to an order whose tracking number has already been applied, check “Overwrite tracking numbers on already-applied orders” in the apply options.
“Overwrite tracking numbers on already-applied orders” checked
If an order has several fulfillments, choose in the confirmation modal, under “Apply CSV row”, which fulfillment each CSV row is applied to. Rows you do not choose are skipped.
The confirmation modal for choosing the fulfillment to overwrite