How to store more than one value in a text field in order to create a hierarchy?
In a text field I have the column "location". This can have "Black Forest", "Freiburg", "Berlin" etc.
Now I want to be able to select only "Freiburg". But right now it just gives me everything that is written in the text field: "Black Forest, Freiburg, Berlin ..."
So how to separate this right from the import?