The best practice is not to assign workflows directly to part and end items but to advance them via Promotion Requests and/or Change Management objects. If you have very specific processes that you want some parts (e.g. component parts) to go through, then you can make a custom promotion or Change Activity workflow.
If you must place workflows on the WTPart and END ITEM objects, you can add an activity after start for the creator that either submits to or terminates the workflow.
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