There are already models for level creation that are used to create different levels. I want to use them to create a new level and I want to assemble the level in Blender.
But if I just import the models into Blender from which I assemble the levels there, and then export the finished level to Unity, then it turns out that I will create duplicate models from which the levels are assembled.
How to assemble a level in Blender in such a situation, avoiding duplication of models when importing?