Ignore Zero / Blanks from Excel

I am using the insert excel component to input data.  The data consist of columns with sparatic values in columns C-I.  Columns A&B are completely full.  I want to graph the sparitic values in C-I against col A.  When the data is imported, all of the blank cell come in as zero.  when plotting they also plot as zero.  I want the plot to connect each value ignoring the zero's that were brought in.

Any ideas?

thanks

Ron