Yes, you can use Marketo custom object data in the email using the email script token. Create a custom email script token at an apt place (program/campaign folder) so the email can reference it >> Under the Custom Object section in the object tree on the right of the email script token editor, select the apt. fields >> Once you have your script ready with the additional logic to display the correct CO data save it, add the custom my token in the email, and test. Make sure to sort you sort the custom object list before you use it in the script token so you always pick the correct custom object record if multiple CO records are associated with a person record. Check out Sandy's article on sorting objects and lists in velocity here.
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