Right-idea #1 -- make a distinction between Excel, a component of Microsoft Office that has a proprietary format, .xls and .xlsx, which requires LabVIEW's Report Generation Toolkit to use, but gives you access to the power of Excel and its tools, and a Comma-Separated-Values (.csv) file, a Text file that has "rows and columns", with the rows separated by OS-dependent "New Line" character(s) and columns separated by commas (or, as in the LabVIEW Default format, Horizontal Tabs).
If you have a 2D array of numbers or strings, LabVIEW's Write Delimited Spreadsheet can create a file with the .csv extension (but if you want comma separators, you need to specify that as an optional input to the Write function). If you drop this function on a Block Diagram, you can right-click it, choose Help, and get information (and examples) suggesting how to use it for "Write All At One" and "Write and Append" modes of action.
Right Idea #2 -- play "scientist". Write yourself a tiny routine where you "make up data" (say, a 4x10 array of random numbers) and try writing them using (say) Write Delimited Spreadsheet. Note that Microsoft thinks Excel "owns" this format, so by default will give these files an "Excel" icon, so if you double-click the file, it will open in Excel. OK, at least you can see the contents -- does it look like 4 rows of 10 columns? Maybe you are doing something right! If you need to do multiple writes, expand your first "experiment" to add another 3 rows and see if this works.
Right Idea #3 -- try do do as much (initial) work as you can. When/if you get stuck, return here, attach your LabVIEW code (meaning the files ending in .VI, or if you are using LabVIEW Project, compress the Project folder and attach the resulting .zip file). Please do not send screen-shots -- we have a very hard time "editing" your code, and an even harder time trying to execute it.
Good luck.
Bob Schor
