Hello ronnymue,
Thank you for your question.
You can use Batch console of Video Splitter to fulfill this task.
1) Load to the Join Manager files you would like to join. Then go to
File -> Save join list.
2) Clear files from the Join Manager and open other files you would like to join (the second task). Go to File -> Save join list and save the second list under the another name.
3) Repeat steps 1-2 for as many tasks for joining you have.
4) Open your saved join lists in the Notepad. Copy from your join lists text that starts from <group name=... and ends with </group> and paste it to the place after </group> of the first join list.
The example of join list with two tasks is
here.
5) Go to C:\Program Files\Solveig Multimedia\SolveigMM Video Splitter, find the "SMM_BatchSplit.exe" in the folder and drag your saved join list with several tasks on "SMM_BatchSplit.exe".
The processing of your tasks will be started.