Можно так:
Table1.Edit;
if RadioButton1.Checked = true then
Table1.FieldByName('NAME').AsVariant := '';
if RadioButton2.Checked = true then
Table1.FieldByName('NAME').AsVariant := '';
if RadioButton3.Checked = true then
Table1.FieldByName('NAME').AsVariant := '';
Table1.Post;
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