Prompt Singular/Plural to reference geometry

So, how does actually referencing the rhino object in set one/set multiple works?

I am building custom class of GH object and GH Param that needs to reference a group of points. I have managed to make a copy of an object, so by set one i have copied tje rhino point into the custom param component, it is internalised and does not change when i change rhino geoemtry. how to keep it referenced?