The command "lt" (small "L" and small "T") type on the sparky screen opens the peak list. There is an options tab once this is opened. Click on the options tab to allow for peak intensity readout. Click OK. Click update. Your peak list should have the associated peak intensity. Click save. The file generated upon saving is a ".list" file.
Open you new spectra and type "rp". This will allow you to read your saved peak list above on to the new spectra. Click browse to select your saved ".list" file. There is a drop down menu below your selected list file. Choose the spectra you want you peak list to be loaded in. You could load two peak lists on the same spectra so be careful. To redefine your peaks on this new spectra list, you can select the peaks individually by pressing "F1" and selecting you peak. Once the chosen peak is selected the ornament should be highlighted. You then can press "pc" to peak center. Go to you peak list by pressing "lt" again. Click update and save you peak list. You can select all peaks with the "pa" command. All of the above commands can be found in the menu by right clicking on the spectra or on the pointer mode ("F1") that is opened when you open a spectra. We have found that peak intensity is most consistent when you use the "rh" command, which takes a little setup and is used for relaxation measurements. You have to have all you spectra loaded, type "rh", setup "rh", click OK, type "pa", then type "rh" again. The rh file can be saved and peak intensity is one of the outputs of the file. The Sparky manual can be found online and is very complete. If I have a problem, I usually type the problem into Google with a Sparky following the problem, like (peak list Sparky).