So I've got a Dop set up with multiple packed objects.

The first is a series of boxes pinned together in a chain using the Hard Constraint Relationship. These are acting as bending supports in my simulation using the technique that Pavel perfected here: https://vimeo.com/105947358 [vimeo.com]

I got this all working just as I want it to, but then trouble comes when I add in the second packed object. This is a set of panels I want to “rivet” to the supports. As soon as I add them to the Dop network, they get added to the Hard Constraint network I set up for the supports.
This is not what I want. I will eventually want to use a glue constraint to attach the panels to the supports, but I haven't gotten that far yet, and it will be at different points regardless.

I've attached the hip file and a screenshot to show what I mean. Any help will be much appreciated.

just make sure the name attribute is different for all of them
or if you want them to have the same names make sure you create name attrib for your constraint anchors containing objname/packedprimname syntax
like stated here:
http://www.sidefx.com/docs/houdini14.0/news/14/dynamics#misc [sidefx.com]

Perfect, thanks so much tamte!