There are several options for changing categories of products in RemOnline.
1. Changing a category in the product profile
Open a product profile. Select or find a category in the Category field and click Save.
Please note that to change the category in the product card, you need to disable the "Disable editing after creating" checkbox in Settings > Form Editor > Products.
2. Changing a category on the My company > Products page
Go to the My company > Products page. Use the checkboxes to identify the required items. Click the More actions button and select Change category and then the category you need.