Multi Select Filterable Lists


I have a basic apps, with 3 Array columns containing different values. I want to do a few things.

One I want each of these arrays, which are currently single select in the form view, to be multi-select. And also, depending on the values selected in col.1, then the values in col.2 will be filtered, and depending on the values on col.2, the values in col.3 will be filtered

Any help appreciated


Can you provide us a sample of choices for these array values? I’m thinking of using joined & split text for this but not sure if it can be done inside a form.