No. There is no reset, no clear-all and no delete-one control: your results are not yours to remove, and the record clears itself only when each attempt runs out its retention. It is a limitation worth stating flatly rather than dressing up.
This is how the history is built, not a button someone forgot to add. If the hope was to sweep a run of low scores out of sight before a stronger one arrives, ProcessExam does not offer that on a process or project management certification exam account, and it is fairer to say so plainly than to imply a workaround exists.
Why your process certification results are read-only
In your account you can open and reread any sitting you have finished, but you cannot alter one. Nothing changes a score, hides a row, or lifts a single attempt out of the log, and there is no reset tucked away in your settings; records leave by one route only, the retention purge, working to its own schedule. The history is meant to show the practice you actually did, in the shape you did it, so it is not open to editing after the fact.
How a project management attempt does leave your record
Attempts still go — just never on command. Each ages out on the automatic retention covered under Does ProcessExam Keep My Attempt History?, and once that point passes the sitting is gone for good with nothing required from you. So the log empties itself over time instead of on demand. If an old low score is what is nagging at you, the move ProcessExam does give you is the one the real exam rewards: sit again, sit better, and let the newer, stronger runs be what fills the record.