Modify SLA \ Custom Field

Modify SLA \ Custom Field

Currently, when I have custom SLA's configured, it is setting the DueBy Date based on the Updated Date, not the Created Date. Is there a way for me to change this to Created Date? When ever I update a ticket, the DueBy date changes and I need it to stay consistent for reporting purposes. 

If that is not possible, would I be able to create a custom field that I can report on that is similar to the DueBy field, but is based on Created Date, not Updated Date, then modify the SLA to apply to that field?

Thanks for the help.

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