I need a SharePoint task list which has different fields available for child tasks than the parent task.
Is this possible within SharePoint Online and what areas would I need to look at to achieve this?
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The list can have fields that apply to the parent task and the child task.
If SharePoint Online is the same as SharePoint 2013, there is a field 'ParentID' that is filled in for child tasks, linking it to its parent. I assume SharePoint fills that in when you indent a task defining it as a child.
It's not included on the forms making it harder to use it to help hide/show fields, but you could add a checkbox like DevBot mentioned and have workflow set or unset it based on whether ParentID was set or not.