Thank you for contacting Syncfusion support.
We have analyzed your query with the attached snapshot. We regret to let you know that currently GridDataControl does not have support to achieve your requirement as shown in the attached screenshot. Normally you can use group header, Nested grids and DetailsViewTemplate in GridDataControl (listed in requirement 1 and 2) but it is not possible to achieve your requirement like under the third level there should be a separate grid with data in GridDataControl.
Please let us know if you require further assistance on this.