Use Combobox instead of Dropdown.
Then Set the allow multiple selection to true.
Finally if you want to save what the user freely types not in the list;
Patch(Table1,Defaults(Table1),{Column1:"ABC",
Column2:
If( IsBlank(ComboBox2.Selected.Value), {Value:ComboBox2.SearchText},
Concat(ComboBox1.SelectedItems,ColumnNameInCombobox&" ")})
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