Control point problem

Hello, I am a student studying Land Surveying and I am currently doing a project about close-range photogrammetry by using ContextCapture. I am doing an indoor surveying in a house. Since separate models are generated from one house and they are going to be merged after reconstruction, may I know should I create control points for them for geo-referencing? Also, since I am using .obj file for this project, is it possible to export the local coordinate system of the model if I use control points? Thank you very much!