Extra columns you import or add on Research stay on the contact and work as merge fields.
Any extra column in your CSV is kept on the contact as a custom field.
On Research, click "Fields".
Add a column by hand or from an enrichment; each becomes a field on those contacts.
Open a sequence from "Sequences".
Click "Add step".
Choose "Email".
Click "{ } Variable": custom fields are listed with the standard ones and merge the same way.
Pick the field to insert it.
Import contacts from a CSV
Upload a spreadsheet of people, map the columns and optionally drop them straight into a sequence.
Add one contact by hand
Create a single contact without a spreadsheet.
Add contacts to a sequence
Select people in the Contacts table and enroll them in a sequence in one go.
Search, sort and choose columns
Find people fast and show only the columns you care about.
Work a contact from their profile
Everything about one person: activity, sequences, calls, tasks, and quick actions.
Verify email addresses
Check which addresses are safe to send to before they go into a sequence. Only invalid ones are skipped when sending.