Dropdown source from an array column

[Darren_Murphy]

https://www.glideapps.com/docs/reference/basic-columns/array-columns

Make Array Column | Glide Docs

For transposing an array for using in an inline list or choice component, you can refer to the below:

Transpose Columns to an Inline List: The Miracle Method

I’m often asked how to take columns of data (say form responses) and display them in an inline list. Here’s one way to do it—the MIRACLE METHOD. [Glide: Transpose Data Columns into an Inline List with the MIRACLE METHOD]

There are also a number of array related plugins available:

Plugins | Glide