PCL does not have a direct interface to Excel. However, you can extract this info and write to a comma delimited file (.csv) and import to Excel. I discussed some of the PCL functionality in my previous post about automating contour plot creation for Pressure LBCs.
You can retrieve Load Case info from the database using functions documented in Patran PCL and Customization . Take a look at Chapter 8: Accessing the Patran Database; specifically sections on Load Cases. Load case info is extracted with a combination of db_get_all_ and db_get_next_ to cycle thru the loadcase names.
Attached is a short function that shows the basic process. It does a limited write to the session file. You can modify to write to a file and use string formatting to clean up the output. This is a prototype and doesn't have a GUI or error checking. It should get you started.