@AlfredoZGC For the future, this is a separate topic, so start a new one next time.
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You will need a sheet that lists all of the Countries.
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You will need another sheet that lists all of the Cities and the associated Country.
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You will need a sheet that lists all of the Districts and the associated City and the associated Country. Create a template column that joins the the Country and City into one column.
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First create a choice component that points to the sheet that contains your Country list. Select a column to save the selected Country.
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Next create a relation column that looks at the selected Country column and links it to the Country in the Cities sheet.
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Next create a choice component that uses the relation above to get a list of Cities for the selected Country. Select a column to save the selected City.
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Next create a template column that joins the Selected Country and City into one column.
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Next create a relation column that uses the template created above and links it to the Country/City template column in the Districts sheet.
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Finally create a choice component that uses the relation above to fill it with a list of Districts for the selected Country and City. Select a column to save the selected District.
FYI: This will not work in Add/Edit/Form mode. This will only work when View mode when viewing a record in the Detail style view.