Defference between Import and ImportSheet

Import method will imports the specified Excel file to the run time datatable.
Ex: Datatable.Import ("C:\sample.xls")

ImportSheet method will imports a specified sheet of a specified file to a specified sheet in the datatable.
Ex: Datatable.ImportSheet "c:\sample.xls", SourceSheetName(or Number), DestinationSheetName(or Number)


If excel file has 7 sheets, if we use import method, then all the 7 Sheets are imported into the runtime datatabe?
The Answer is No. Only the first 2 sheets will be imported into the runtime datatable.
Not all the sheets.
why because, By default datatable will have 2 sheets (Global/Local)
If you add an action in the QTP then only, a new sheet will be added in to the datatable.