You could use the JIRA Misc Workflow Extensions to copy a field value to another field in a post-function of your workflow.
You will need to check your id of your customfield, you can easily does that by right click on the text input area and inspect element (chrome and firefox). Then replace the value of customfield_10100 with the value you got.
Hope this helps :D cheers!
I have personally verified on my local 5.2.6 and it works. Do let me know what problem have you encountered, you need to paste the codes to the description field (preferable) of the custom field for it to take effect.
Let me know if you have problem executing this.
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