using this condition, we could set the values in workflow for the old records if status shipped in item fulfillment to send the email.
Solution:
Added the context called shipped in workflow execution.
Added new condition old status not shipped and new status shipped.
Condition: Subsidiary (Main) = OX Tools AU And email-sent = F And (Status = Item Fulfillment:Shipped And Old Record : Status != Item Fulfillment:Shipped) 