Hi @xkdsofa,
I think what you want is the Split command, with the EdgeLoop option. In that command, you can select the edges where you want to split on the SubD on the left (double click to select the whole row), and if the resulting SubD is in multiple parts they will be exploded.
Side note, “creased” edges in SubD are not “unwelded”. This is why explode has no effect on the SubD in the center of your picture. In you sequence, if you use UnweldEdge instead of Crease, then Explode will work like you want it to.
UnweldEdge That’s what I want. Thank you