'I couldn't find a topic or hint for creating subtasks or nested tasks in Outlook Task
Is it possible to add a sub-task to Outlook, or do we need an additional addin to do so?
I tried to look into it, but I couldn't find any information about it.
Solution 1:[1]
Web add-ins don't provide anything for creating new items in Outlook. You may consider using EWS from a web add-in, see Call web services from an Outlook add-in for information. Also you may consider using the Graph API, see Build Office Add-ins with Microsoft Graph. This is a preferred and recommend way of doing that.
Sources
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Source: Stack Overflow
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| Solution 1 |