Change and auto update bpmn schema

Hi. I want to draw 100 bpm diagrams in my angular project and save them. And I want to relate these diagrams to each other. For example, when I change one of them, the others must be update automatically. I can use angular framework for drawing and spring boot for backend. I have already drawn diagram in angular project. But I cannot establish relation backend and fronted to update diagrams automatically. What should I do? Can you advice starting point ?