Map your own categories with Rakuten's categories at the Categories mapping step.
Please note that a more precise category configuration is done at attribute level, by selecting a product type in the "type_product" field.
Example : to assign a product in the "Bricolage> Quincaillerie > Ruban adhésif" category, you will select "Bricolage" at the category mapping step, and "Ruban adhésif" in the drop-down menu of the "type_product" attribute. "Quincaillerie" is a general product type assigned by Rakuten.