I have two custom fields of type Select List (Single choice),need to populate Field 2 at run time

[Yogi Rajpal]

on Jira Cloud :

We have two custom fields , We want that when a user selects a value from list in custom filed 1 based on that the custom filed 2 should get populated i.e only items relevant to custom Filed 1 list value selected should show up in custom Field 2 List.

Both fields have values which are pre-stored in the list 

Custom1 : Item 1, Item 2, Item 3, Item 8, Item 9 , Item 10

Custom 2 : Item 4, Item 5, Item 6 , Item 11, Item 12, Item 14

if user selects "Item 1" in Custom1 then only "Item 4" and "Item 6" should be available for selection in Custom 2 List field.

This requirement is while creating a issue .

[Alexey Matveev]

You should use Select List (cascading). When you create the field there will be 2 fields created. You can set options for the first field and which options should be visible in the second field when an option in the first list is chosen.

[Yogi Rajpal]

Thanks Alex this helps me solve the issue. 

[Sandra Meessen]

Hello Alexey, I have 2 custom fields cfB (select list (single choice)) and cfC (text field (single line)). I introduced a new custom field cfA of type "select list(cascading)". Purpose is to get cfA as replacement of cfB and cfC. So I have to get history of cfB and cfC into cfA. cfB into 1st part of cfA and cfC into 2nd part of cfA?

What can I do? A specific workflow step with Post function "copy value to another field" doesn't do the trick. Is there another way? Thank you