Hi,
By what i can get out from your question,i think you want to save some data everytime you run a vi ,do you want to save this data in a text file or XL format ,any format is fine all you have to do is in the save option of file you wil have to rename the file name,i mean if for the first time you have a path like say c:/testdata/trial1.xls then for the next you will have to give a path of c:/testdata/trial2.xls and so on so this will solve your problem.
vicky