1. First prepare your spreadsheet with three columns, Name, Rule, and Rule_name. The name is your part spec group name, and the rule is your main component. The rule name is the alternative parts for your main component.
2. You can find the import under Admin, API and more. Then go to Data Import, and select part spec groups in the 'data type to import'' dropdown menu.
3. Upload your spreadsheet. Double check the headers line up, and import.
4. To double check your groups, go to parts, part spec groups, and you should see your new groups you imported. That's it, quick and painless!