Add text to a text field without replacing the existing data and without the name - date stamping

Do you want to import these changes or enter them one at a time using the form?

If you want to import en masse such a change to a text field without overwriting what is currently there, you may need to use an intermediate formula text field, and, a new text field to import into.

Can you provide your desired approach to making the edits to this text field?