I have used batch output to output a particular tab to a specified powerpoint presentation.
Each time it seems to overwrite the powerpoint and I need to be able to "append to the end" instead like you can when exporting to powerpoint not via the batch output.
In the batch configuration file you have the option to specify the "Insert behaviour". This is only applicable for PDF or PowerPoint files. Enter "overwrite" to overwrite the file (the default), "beginning" to insert at the beginning, "end" to insert at the end or "after:[PAGE NUMBER] to specify a position.
Note that you won't need to regenerate your command file with a blank template. You can simply compare with a new blank template and add the missing fields.