You have to customize the workflow code. This sort of work is described in the Administrator Guide for the product. Your workflow code must already be customized to some extent for this to work at all. You'll need to carefully review the customized code that is already in place and figure out how it needs to be modified. I would recommend you make a copy of the project and figure out the code modifications in the copy first, so that you don't irrevocably damage your project.
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