How do you create multiple HLOD clusters from selected static meshes?

how do you create multiple HLOD clusters from selected static meshes? I am trying to different distance levels… 1 for closer grouped up objects… and another for far away all together as 1 big proxy …

Problem is… if i add any meshes into the first group of clusters… then i am unable to add those same static meshs to a further group that has everything for hte proxy… it literally says something about them already being in a cluster… Whats the point of that?