How to maintain the original position of the previous model and add the new model relative to the previous model's position.?

Could you please assist me with this situation? I want to add a new model to an existing scenario. When I tried to import a new model, all of the root’s children meshes were reset to the origin. (0,0,0)

How can i use old model relative positions in new model children meshes?
whereas the _root mesh is correctly positioned.

could you share a repro of how you are trying to do it in the playground ?

A playground would definitely be helpful. It sounds like you just need to save the root position of the previous model and apply it to the new model? Assuming the pivot point of the model is the same.