dowunload data in different sheet of the same excel file

hi all,

i have three internal table and i want to download the data in three different work sheet of same excel file, i am able to down load only one colum of internal table but i want that the work sheet should contain all the colums with the record,

i mean i am havin internal table say it_mara now in this table i have various colums

i want that the hole of the colums should be down loaded in the work sheet.

and i also want to give the heading to ecah of the cell, and after heading data should appear, friends i am very new to OLE concepts please give some importent information regarding my problem,

full points will be allocated to all the useful help,

thanks in advance,