So that our dropdown list adapts dynamically to the data source, we first have to dynamically design the data source (s) ourselves.

In our first example, we compile a list of states and (part of) their respective cities.

• We mark our respective list.
• Then click in the tab: “Paste” on “Table”
• And put there also the hook with “table has headings”.
• Then we assign a name for each of our tables, which should match the title of each table.

See picture: (click to enlarge)

In order to create our first drop down list for the selection of the federal states click into the desired cell in which the selection is to be available, and then click in the tab: “Data” on “data check”

There we select first as an option the data check “list”, mark our first list with the federal states as an associated data source, and confirm with “OK”.

See picture: (click to enlarge)

In the next step, we limit the choices of the dependent drop-down list by referring to our previously set dynamic tables.

For this purpose, we first mark the cell in which our second drop-down list should be.

• Go over the “Data” tab again in the “Data Review”
• And there select “list”.

With this function, the list refers to the previously created tables.

We therefore select a table in the first drop-down list, and the second drop-down list uses the “Indirect” function to see which entries exist in this table (exclusive heading), and only selects these according to the preceding entry.

See picture: (click to enlarge)

The big advantage of drop-down menus related to dynamic lists is that they automatically adapt to the length of the list entries.

As soon as we add an entry, it will be available in the selection. And when we remove an entry, it also disappears just as quickly.

To look forward to the o.g. For example, we would need to refer to, for example, Add another state to create a new table (renamed), and easily include it in the drop-down selection.

To add new cities to existing ones, we extend the table either by:

• Press the TAB key in the last cell of the table.
• By dragging the list at the bottom right (colored reinforced edge) with pressed left mouse button.

Or by a new entry in an empty cell below the table.
(iD.R., the table is automatically expanded here, and a query appears if so desired.)

Of course, this procedure of the dependent drop-down lists can be continued.

So we could next, for example, depending on the city, still on the municipalities, and then on street directories continue to filter.