How to change Get Title Property From Column by blocks?

Here’s the thing.
My team are making a Public Transportation Information System.
Our plan is making two Data viewer,First viewer is about which metro line user will want to consult,and it will navigate user to second viewer and storge down which line they choosed.
We want to use that varible to define the Title Property of which line’s station will showed up,but we can’t find a way to make it work.
Well new users can’t upload more than three pictures so i will told the funcion by text.

Screen2 will show the data viewer and show the full name of the metro line and let user to choose. After they choose, 2 variable(Line short/Line long) will storge the line they choose, and we hope we can use that data to change Get Title Property From Column and control which column showed up in StationDB will show.

And Here’s the picture left.
↓Screen3


↓Screen3’s block

↓charts

With Data Viewers, you map the labels’ text to columns. Did you do that for a the Title?

Since i’m not sure how this works so i snap something that might work with it to have a try. Thats how it left there