Merging Different Power BI Reports

Hi,we have 4 different Power BI Reports that we need to merge to one.There are different KPI's sheets on these reports and buttons,so we need to merge them to see KPI's at one place.Because of our buttons we can't use the dashboard to pin the visuals.How can we merge these report pages from 4 different Power BI Reports into one Power BI Report?Thank you for your time.

P.S: 4 different Power BI's use different datasets(different excels)