Go to Admin and click Field Management.
Click New Custom Field.
Choose the field Type. This will change how it is rendered in smart lists and forms in Marketo.
Enter the Name as you want it to appear in Marketo.Pick the Name and
The API Namecarefully, as renaming fields can be difficult and in some situations not possible.
is automatically generated. You can tweak it, but it cannot be renamed once set. Click Create when done.
The automatically generated API name is used by the SOAP API and other backend processes.