1. Populate an sObject variable with the values from the existing record.For example:Look up the record with a Fast Lookup element.Obtain the record from a Flows action in a process.
2. Look up the record with a Fast Lookup element.
3. Obtain the record from a Flows action in a process.
4. In an Assignment element, copy the writable field values to a new sObject variable. Note Make sure that Id isn’t set in the new variable.
5. Add a Fast Create element to your flow. Select the new sObject variable to populate the values of the new clone record.