Separating fractured objects for a DOP system

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Hey Guys.
First time posting here.
I'm pretty new to houdini so sorry if this is a really simple feat but I'm stumped.

As you can see from the image i've attached, i've fractured a box and clustered the exterior pieces into one big piece. I want to use that object (the grey one) as a static object (it's supposed to be the ground) and the fractured objects as RBD objects. Is there a way to get my AutoDOP network to treat the clustered object as a static object and treat the rest as RBD?

If it helps, I'm trying to set up an effect where an object impacts the ground and throws all the debris into the air (the grey box is meant to be the ground, and therefore needs to remain static).

If this question doesn't make sense let me know and i'll try to explain myself a bit better

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Just set the box's initial object type to static object if you want to prevent it from moving in the sim.

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