There's an existing RFE for that, but currently it's not possible. You can choose the sorting order which will affect which work item's attributes appear on the partition, but concatenation isn't support for anything but the output file list. I posted some Python snippets here:
https://www.sidefx.com/forum/topic/72957/ [
www.sidefx.com] Those show how you can handle it manually right now, using a Python Script or Python Processor. I'm hoping to tackle the RFE between now and the next release, and when the change is done it'll be backported to older version as well (18.0 for sure, possibly 17.5).