Now that we've created the "Internal" tracker and its items (that is, the dynamic list of OS/Version combinations) we need to add these items to the "External" tracker.

To accomplish this, we need to create two new fields in the "External" tracker: one for the operating system selection and one for the version selection.

The relationship between the Internal tracker and the fields in the External tracker.

Add the following fields to the "External" tracker:

Your "External" tracker should appear similar to this:

The completed External tracker with the dynamic list from the Internal tracker.

Using the Tracker

Now that the "External" tracker includes the dynamic fields, the final step is to update the form we built previously to include these new fields.

1. Update the TRACKER plugin to include the new fields
   

   {TRACKER(trackerId="1", fields="1:2:3:4:5:6:8:12:13", showtitle="n", showdesc="y", showmandatory="y", reset="Clear", submit="Send")}
   Thank you
   {TRACKER}

2. The form now includes the new fields:
   
   

   The user information form with the new operating system fields.
3. When you select a specific option for the Operating System, its available Version options appear.

You can also update the Trackerlist plugin to display the new fields:

The user list with the new operating system fields.