To save time keying in individual user data from lists, you can import it into the database in user groups.
Method 2 - Import them as users if you want to add all their details.
Format the list in a CSV file with the first row containing the column headings (you can obtain an example of this in the Export System > Users). You will probably want to add contact details and other fields this way plus other relevant fields
i.e.
If you are using ecommerce to take orders, check valid address entries in Delivery Manager > View Delivery Regions for regions and countries.
It is recommended you take an export of the current user data in Export Manager first as a backup
Import the new data in Import Manager
Check it has imported in User Manager by searching on the first and last entries in your spreadsheet
You now have the user data in the database and can email them or add them as prospects in Prospect Manager.