Don't confuse Excel, the name of a Microsoft Program that and write and read a variety of "Spreadsheet" formats, including its proprietary .xls and .xlsx files, as well as ordinary text files that use the Comma-Separated Values (.csv) format, with what LabVIEW calls a "Spreadsheet File" or a "Delimited Spreadsheet", which is an ordinary text file that uses a delimiting character (by default, <tab>) for column separators and "lines of text" for rows.
You should probably spend a little more time learning LabVIEW Basics. You will know when you've "learned enough" when you can stop using Express VIs.
To read a particular column from a LabVIEW Delimited Spreadsheet File, the easiest way to do this is to read the entire file (quick quiz -- what is the output from such a read?) and be able (with a single function) to isolate whatever row or column you wish to process. If you can't do this, go back to the previous Bullet Point.
