My task is to update a custom field - 500 + issuekey(only the digits).
I am able to do it using Copy parsed field post function but it gives the entire issue key.
How can i go forward?
Since you're using Workflow Toolbox, perhaps you should reach out to Fidel? He offers great support.
The documentation is quite rich too, you really should give it a read – https://bitbucket.org/fcarmario/jira-workflow-toolbox/wiki/Full%20List%20of%20Features
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