I want to upload company names with different info connected to them, these names are separated in my excel files by categories. 1 company can be in multiple categories but have different information. These different  information is indicated as a manytomany on my Odoo database, however instead of keeping these information when I upload the categories, Odoo simply overwrites what was uploaded previously. Is there a way to upload data and Odoo simply adds this data, instead of overwrite it?