firework explode rbd multisolver

[ela1995 0]

I rebuild the firework system base on firework workflow in Houdini 18 so I can have better control in several parameter. But how do I turn those sphere into rbd object and have them collide each other in a box. I watched the multisolver online from this guy (

) but I can't figure out how to combine them. Can anyone help me please.

 

Thanks in advance,

firework box 2.hip