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1. Click Edit for the workflow that has the transition you wish to add the post-function on.
2. In the Workflow Designer, select the transition.
3. Click on Postfunction in the properties panel.
4. Click on Add postfunction.
5. Select Copy Value From Field / Custom Field Postfunction from the list of postfunctions.
6. Click on Add to add the postfunction on the transition.
7. Fill the form shown below and press 'Add' button.

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Fields

From field – The source field from where copy the value.

To field – The destination field to where copy the value.

User - If select, WMB will use this user to comment the issue.

Enabled - If checked, the Postfunction will be executed.

Alternatively, you can configure this postfunction to run only when the 'From field' will not be empty