Hi Mike, 
This seems more like LabVIEW programming, than CA N communication.  I assume you are getting your CAN data using the Channel API CAN Read.vi using the Multi-Channel Multi-Sample data type. 
You need to retrieve the single channel data for the 2D array.  You can use the index array VI in the Array  function palette. 
With a 1D array you can then use the Array to Spreadsheet file VI in the File I/O function palette.  This VI also accepts a 2D array to log all the information. 
A good resource for this type of questions is the 
LabVIEW support site.  Click on LabVIEW Tutorials and Example Code >> Fundamentals.  You'll find links to tutorials and examples for 
File I/O and 
Array and clusters. 
Hope this provides some help. 
DiegoF
National Instruments.