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nesh
Is it possible with workflow rule
In Training Tab, When a Trainee status -pass-,a newtask will be assigned to xxx.Task will be assigned to xxx"and will be closed by a check box in the TRaining Tab(.Create a new check box in the Trainig tab, if this check box is checked, the task should be closed.)
You can not do that with Standard Functionality of Salesforce because Cross Object Field updates does not work for Activities. In order to do this you would have to create an Apex Trigger.