How we can Provide a custom field as a key value to find a line item

You can map integrator.io to use a custom or standard field to find an existing line.

The custom field called eTail order Line ID, which is unique for all the lines in that record. You can use this field to find a matching line with the field value:

1. For the mapping to eTail order Line ID, click the Settings button.
2. In the resulting Settings pane, check Use as a key field to find existing lines.
3. Click Save.

When the key field option is enabled, integrator.io tries to match the field value from the source data against the field value in NetSuite lines. If it finds a match, that line will be updated; otherwise, a new line will be inserted.