Input data from text file narrow down in object

[JGoode]

Hello,

I am trying to work the best way of inputting data from a text file and then being able to narrow the list down within the object.

Thanks

[Laszlo Nagy]

There are several way to input from/output to files in GDL. You should check the GDL Reference Guide. You can work with TXT files, "Data Files" (you define the format in the file, but basically a text file), XML files.
After you input that data you can work with array and I guess you can narrow down the array into another array that contains only those items that fulfill your criteria.