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Newbie Needing to update a field

I'm trying to update a custom field I created in a Task named "Time Zone".  I want to update this field everytime a task is created with a field in a lead.  The field in the lead has an Id number of 00NA0000001EtRV.  I made a workflow to trigger the field update when the field is "NULL", but don't know how to write a formula to say I want the task "Time Zone" to equal the lead Id (00NA0000001EtRV).