I am trying to upload all of my products to Google Merchant, most of which have assigned attributes.
Is there a global field that will allow me to add a single "brand" to all of my products? If not is there a way I can add brand to all of my products in bulk? Similarly, I need to add MPN's to all of my products and I would like to do this in bulk too?
In your OMS, go to products / export/traffic tools / product export. Then populate field of Manufacturer and MPN for each product. Re-import spreadsheet. If you have attributes with separate MPN's and brands you will also need to use the attribute export. Populate the fields of each MPN and brand for each SKU.