Please help me clarify how to delete orders.

I am only able to delete them when they are in the ordered status.

If they are Completed or in the Deleted tab, I have to convert these back to Ordered status =to delete them.
In my practice the checkout changes the ordered status to results pending, hen a test is completed.

When results come in it gets completed to Completed and is linked to the test result.

How does all this play into CMS Meaning fulluse of CPOM.
The progress note shows what was ordered before the chart is signed off. So there is at least some proof for the auditors.