The following explains the instruction numbers in the diagram above:
1 : Ensure the bulk mode is on (showing as green)
2 : Click the import items button
3 : Select your comma delimited data file by clicking on the choose File button
4 : Locate and select your file. The content of the data file can look as shown with the red arrow. Only the first column meant for primary identifier is mandatory, but, ensure the comma is there even when the field has no data.
5 : Click the upload button, and the data fetched from the file will be displayed in the table as shown below. Continue with validation.