How do I Import data into custom fields?

Yes, you can import data into custom fields. 

1. You must create a custom field in a module by going to Settings: click your display picture displayed in the top right corner. Go to Settings > Module Management > Module Layouts & Fields to create a new field. 
2. You must specify the custom field name and a value for it in the local file being imported (.csv, .ics, or .vcf).

To know more about Import, Click Here.