Show the child graph content to the parent graph

Hi, I have some graphs (called subgraphs). In this graph, a group node contains some nodes and links. I saved the position and size of each node.

Graph 1

Graph 2

Now I want to show those two-graph(sub-graph) content to the parent graph like this.

In the parent graph, I will save only the position of the subgroup node but the inner content position will inherit automatically. I didn’t use any Layout. I have used placed holder in the group template.

So Please give me the solution on how I can show the child content to parent content.

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