Connection point of 2 gltf model combining

Hi I want to know how we can combine the gltf models in runtime.Like if I click on one model,the position will be set and if I click on the second specific position,then it will animate the model and set the model of first model which we set the position.So how we can do it.Like I check the hirerachy of model after loading then there is no point ,face , object property to get it in code .Need your help thanks