I attached an image that contains the way the subreport is being printed on the main report, any tips on how to center the subreport on the main report?
So it is hard to derive from the image, where your supbreport is being called, created ?
First make sure your subreport does not have page margins, the margins might cause unexpected outcome displayed.
Ensure you subreport witdh is not more that your main report.
The placement and alignment of your text field/components in your subreport also has an effect.
You need to get all of this set correctly and aligned for your disired outcome.
Hope this helps.