yes,we use datatable.import for import data and 
datatable.export for export the data

yes,we use datatable.import for import data and 
datatable.export for export the data

We can import or export the data from Excel sheet in 2 ways.
1. by using Datatable.import("ExcelFile")
            Datatable.export("ExcelFile")
2 Place your mouse over datatable in QTP and right click -> 
File -> Import File /Export

her i want to add some thing 
if you want to import particular sheet then you can use 
ImportSheet method

DataTabe.ImportSheet("path of Excel",Source Sheet,Dest 
Sheet)