Allow users to enter data but prevent user from deleting data once entered

Good Evening,
I am working on a spreadsheet for users to have the ability to enter data but not remove it once it's entered. They will need to be able to enter data into multiple cells. The current code below is what I have started with, but it is not working. Any help would be greatly appreciated.

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sktneer,
This worked perfectly in my test piece. Thank you so very much. Since we are trying to protect all entries by staff member, is it possible to prevent the worksheet itself from being deleted as well?

Thank you kindly,
Chgardne

I added worksheet protection. I forgot about that.

Thank you again for your help. This has solved my issue.

Chgardne