How to implement array of nested arrayshttps://community.appian.com/discussions/f/general/39508/how-to-implement-array-of-nested-arraysHi all, I have to implement one requirement as shown below screenshots, I have a button called &quot;add period details&quot; then a form should be will be displayed to user and add the period details. This should be an parent array. In the same form there shoulden-USTelligent Community 12RE: How to implement array of nested arrayshttps://community.appian.com/thread/150289?ContentTypeID=1Thu, 24 Jul 2025 05:21:28 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:70c08a10-d902-4a69-bef6-f601542f0826Shubham Aware<p>I am not sure what issue you are facing(Help us with your actual problem in design) but quick suggestion.<br /><a href="https://docs.appian.com/suite/help/25.2/cdt_design_guidance.html#nested-cdts">Appian recommends only using nested CDTs for one-to-one and many-to-one relationships due to performance issues.</a><br />I would recommend use flat design with two separate CDTs where ArmTitles contains a foreign key (periodId) referencing PeriodDetails, implement two separate editable grids instead of nested forms, and handle the parent-child relationship through queries and process logic rather than CDT nesting.</p><div style="clear:both;"></div>RE: How to implement array of nested arrayshttps://community.appian.com/thread/150282?ContentTypeID=1Wed, 23 Jul 2025 17:56:47 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:05e9c2e3-22b8-4829-a513-7b9750777025Stefan Helzle<p>Use the data type constructors to create the parent element and populate the nested field with a list of children. Seems to be a simple task. Where are you stuck?</p><div style="clear:both;"></div>RE: How to implement array of nested arrayshttps://community.appian.com/thread/150280?ContentTypeID=1Wed, 23 Jul 2025 17:30:47 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:7ebe05bd-8a7e-46fd-b923-4ff9b8f85f23Harsha Sharma<p>Hi I understand your use case but not sure what is the issue/problem that&nbsp;you are facing. <br />Are you seeking UI design inspiration or is your doubt about logics/code structure to support addition and deletion of projects and respective arms?&nbsp;</p><div style="clear:both;"></div>