When I perform an operation such as a poly split, I want to create a group that contains all the newly created Points, how can i achieve this?

One way would be to append a group SOP prior to polysplitting, create a point group of everything, then add another group SOP after the split, then in the Combine tab of the second group make a ‘newpoints’ group != your first group…

Cheers,

J.C.

Thanks for your advice, but I did not get it to work properly.
Since the new geometry created will have the highest vertex numbers, I wanted to group by an expression like such:

FROM: Object.TotalNumberOfVertices TO: ObjectModified.TotalNumberOfVertices

I know there is a variable called $NVTX which returns that value, however I do not know how to access it from within another node. I could use some help with the expression syntax here.

JC's method should work

Thank you for your example file, I understand it now.