Subdiagram without moving

Is there a way to add sub diagram without moving this diagram in project structure in “Model Explorer”?
As a link not a child diagram.

Robert

I’m sorry that the sub-diagram imply a parent & child relationship between model & diagram, therefore adding sub-diagram to element must change the model structure. You may consider to use the Reference to link up model and diagram to avoid change in model structure. More details about how to create reference can be found at Adding references (File, URL, etc) to model elements - Visual Paradigm

And details about the differences between sub-diagram and reference can be found at Sub-diagram vs Reference diagram - YouTube