PDF Form Dependent Dropdown Menus

From your description it does not sound like you really need a second dropdown. I would go with the suggestion from try67 and use a text box. Here is an article on scripting this type of arrangement:

https://acrobatusers.com/tutorials/change_another_field/

However, if you want to have two synchronized lists, where the user can select from ethier, and the other will change accordingly, then this is possible as well by using the same technique explained in the article above, but with some twists. 

You can read more about list handling here:

https://www.pdfscripting.com/public/List-Field-Usage-and-Handling.cfm

https://acrobatusers.com/tutorials/js_list_combo_livecycle/

Hey,

Thank you for reaching out.

As per your description above, you are trying to create a dropdown that auto-populates the menu depending on the selection made in the first dropdown. There is no direct option to achieve this in Acrobat. However, you may use a script to achieve this workflow.

You may refer to the suggestions provided in the following community thread with similar discussion: https://community.adobe.com/t5/acrobat/how-to-populate-drop-down-list-based-on-multiple-text-box-entries/td-p/10363227?page=1

Check if that helps.

Thanks,

Meenakshi

The second field should be a text field, unless you want the user to be able to select from multiple descriptions for each product (which I don't think you do). Do that and then you'll be able to use a simple calculation script to populate it based on the value of the Part1 field. Something like this:

var p = this.getField("Part1").valueAsString;

if (p=="1111") event.value = "thermister";

else if (p=="2222") event.value = "misterthe"; // etc.

else event.value = "";

Post the question in the forum for Adobe Acrobat.