I want to add a field in the same format as the description field (system field). I want to implement it so that it can be collapsed and expanded as a tab like the description field. I am using the script runner addon. How can I implement this?
the description field is a normal multiline textfield.
The expanding and collapsing you mean is a section. They are predefined. You have the Details section, description section and people and date section and so on.
You can't add further sections.
Perhaps it will Help you. If you create in your View Screen a second Tab. Then you can switch in the View Screen in the details section between first and second tab.
See the documentation: Point Configuring a screen's tabs and fields
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