Alignment
An option to apply an alignment of the subreport pane is provided on the Alignment tab of the Subreport Property Editor. You can either snap to a chosen point on the maximum (outer) report border, or snap to a point on the (inner) page border:
Horizontal and Vertical offsets from the chosen snap point may be specified (in millimetres or inches, depending on the page units).
You can also align a sub report by manually dragging and dropping the sub report in the Designer.