I am trying to import a list of products and I get the following error warning: mb_strlen() expects parameter 1 to be string, array given in C:\xampp\htdocs\shop\includes\unicode.inc on line 404..

How do you define a hierarchy in the node import? I am trying to import a list of different products and I would like to know if it is possible that the node import can create sub categories. What does the >> in step 5 mean?

Please