You can have Athletics.app do the series assignment automatically. You set this up through the wizard, step 13.
If you want to view the PRs entered, you can see them in the startgroups/startlists. (at the top of the green bar: Timetable --> 'Edit timetable and startgroups' --> Click on a startgroup. There you will see all athletes with their given PR.
You can also download an Excel there. You can find this button at the top right of the table.

This has been automatically translated into English