I am in the process of creating a virtual museum. I have already created the museum and the artefacts. The problem is that I do not know how to place the artefacts in the museum building. I am using unity as my game engine and blender to model my 3d objects.The museum was created in blender and then imported into unity. Please help.
not 100% sure if I understand your question. Are you trying to place your artifact models inside the museum model? You can select them and physically move them to where you want them to be in Unity. You can even go as far as place them in blender and import them all as one object, assuming that this is what you are asking.
If the artifacts are static, just import them in the project window and drag them onto the scene view or hierarchy, just like you did with the museum. If you need them to be interactive somehow, you might need to use colliders and rigidbodies also.