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If possible download standard POAPPRV (PO Approval) workflow.
Copy PO Approval Top Process to create
<YourCompany>PO Approval Top Process eg. xxPO Approval Top Process .
Inside the process you can similarly create new custom sub process and packages by copying standard packages and include your custom requirements.
This way you can keep standard code untouched. However in future you need to keep track of those changes for while Patch and Upgrades.