I am very new to CV. I would i check to see who set up a job/client in CV?
I beleive the Audit Trail Report may help you find what you are looking for.
What is the job type/task type that you're looking to narry down? Some are System Created, while others are manually done, per SG1's suggestion, that report will find if a user did create something (to some degree only)
A job summary report will allow you to select the 'initiating user' under the selection tab in the job information section.