Here is a link to the steps to withdraw any pending submissions so long as they have not been assessed:
I'll go head and close this ticket, but please let us know if we can help further.
Things to be aware of ...
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Callstack: at (Web/Academic/E-Portfolio_-_Chalk_and_Wire/FAQ/How_to_withdraw_unassessed_duplicate_submissions), /content/body/div/pre, line 1, column 1