I have a base diagram and want to add another gojs diagram inside the node of my base diagram. Is there any possibility to add? if yes, please share more details.
Normally that is achieved by having a Group that holds a subgraph: GoJS SubGraphs -- Northwoods Software
However, you would have to decrease the scale of each of the group’s member parts.
For example: Regrouping Demo with shrinking members
Alternatively, if you don’t want that nested diagram to be interactive, you could just show an image of the Diagram in a Picture. Call Diagram.makeImage or Diagram.makeSvg to produce that image of a separate Div that hosts the nested Diagram.