When creating a Recurring Task in Salesforce, the available frequency options are Daily, Weekly, Monthly, and Yearly. A native "Quarterly" frequency option is not available. However, you can configure a task to recur quarterly by selecting Monthly frequency and setting the interval to every 3 months. Similarly, a semi-annual recurrence can be achieved by setting the interval to every 6 months.
Before following these steps, ensure that the Task page layout has been updated and the Recurring Tasks feature has been enabled in your org.
Before creating a recurring task, confirm that recurring tasks are enabled in your org by following the steps in Enable Creation of Recurring Tasks.
To create a task that recurs every six months, follow the same steps above but set the repeat interval to 6 months instead of 3.
Create a Recurring Event or Task with Data Loader
Salesforce Support YouTube video
How to Enable Recurring Tasks in Lightning Experience
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