Unfortunately, there is a limit on the number of channels that can be viewed in a graph at the same time. However, you can group together channels so that you can view a set in turn.
Please see section 126.96.36.199 (Select parameters) in the PicoLog manual (http://www.picotech.com/document/pdf/plw.en-4.pdf
) and follow through the text in there.
You can export data from PicoLog to a spreadsheet application - see section 3.8 (Export data to a spreadsheet) in the PicoLog manual. You can save the data to a .csv or .txt file which can then be imported into MS Excel and saved as a .xls file.