Combined Custom Reports

It would be great if we could combine the different selections for custom reports to be able to add more information on the reports. For example: I am creating a new pension report so I can just upload it onto the portal for a manual pension submission, but the report needs the annual salary of each employee as well. On the pension report I can't add annual salary, but if I could combine this with another report, I would be able to do this. This would also help for other reports.