SharePoint excel sheet connection with Power BI web

Hi,

I have published my Power BI report into Portal. And I have uploaded my Excel sheet into SharePoint.

I got that excel sheet using "Get Data" and I select files and I conneceted to SharePoint and connect my excel sheet to Power BI.

I want to know how can I connect that excel sheet with the Power BI report I uploaded. Because I want to put sheduled refresh whcih I can do the refersh automatically. 

When I publish the report into Portal in workbooks it show the sheet which I used for that report. But I want to connect SharePoint sheet with the Power BI report. 

Thanks,

cham