[QUESTION] How to handle with multi-graphs?

[HB-Liang]

Hi, thanks for your excellent work first.
I am interested in Hydra-multi system but there still some time to wait.
With two generated 3DSGs in the form of json file, one generated 3DSG and a /dsg topic, or two /dsg topics, how can I merge them together?
I first come into the ID conflicts when two graphs are going to be merged when my group are brainstorming.
Could you please provide any advises or guides?
THANKS.