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You would want to first create a custom state to hold the list of selections made from the series of selections (keep in mind they all need to be of the same data type)

So if you want users to select from a data type called fruits and they select from drop downs a series of fruits to create a list of fruits they selected and then display that list of fruits in a dropdown, you would create a custom state that is of a type ‘fruit’ and check the box to signal it is a list.

Then when a dropdown changes its value (workflow event) add that dropdowns value to the custom state list of fruits.

Here is a screen shot from a demo app that shows a page with 6 dropdowns all of the same type, and I want to ensure the dropdown choices do not show options previously selected.

Screen Shot 2021-01-15 at 1.15.46 PM
Screen Shot 2021-01-15 at 1.15.46 PM697×500 58.2 KB

I apologize in advance for not providing the editor view as this app is provided to students enrolled in my Bubble Bootcamps.

This app is creating a survey of the survey takers top six choices.

One thing that will prove difficult about this method though, is that if the user decides to change their selection, you will need to find a way to know which was their previous selection to remove it from the custom state list…this could be done by having a custom state on each dropdown to store the single selection and using that value to remove it from the list of all selections before adding the new selection into the list and the single selection custom state.

On your repeating group the data type would be ‘fruit’ and the data source would be the custom state list of fruits selected.