When configuring an option field, or creating or editing a lookup list, the Bulk Entry button allows you to add multiple options at once.
In an option field's properties, click the Bulk Entry button.
Paste a list of option values into the field. Option can be separated using the Enter key.
2. After all the options are in the bulk entry window, click Save Options to convert the list to a set of options.
3. Click Apply.
Read more about using Bulk Entry to build a Lookup List.