Help! Question about datasets

[TechoGirl0]

Hi, I am new to PowerBI service and now must use it on a day-to-day basis at work. I couldn't find an solution to this issue specifically online, so I thought I would share it here.  I was told to take a dataset (that exsists in PBI service) and put it "under" an exsisting report in PowerBI desktop. In PBI desktop, I navigated to Transform Data->Data Source Settings->Select a dataset to create a report. When I clicked the appropriate dataset, most of the fields in my report disappeared. Am I doing something wrong here? Is there another way to place a dataset under an exsisting report? 

Any suggestions or help would be much appreciated!

[Anonymous]

Hi there. Could you give a little more context? What is the report and what is supposed to happen with the existing data that was already "under" the report?

[TechoGirl0]

The report is couple of pages long and displays percentages and certain metrics. I am supposed to replace exsisting data in the report with the "demo" data in the demo dataset. 

[Anonymous]

@TechoGirl0  is the demo data in a SQL db somewhere? Or a spreadsheet? Multiple spreadsheets? Also, I'm assuming that the demo table has the same structure (fields, file name(s), etc.) as the data its replacing?