You can use the Transform tools to align the individual models in a merged model.
The transformation applies only to that merged model. It is a one-time process. As the individual models of a merged model are updated, the transformations are applied.
In the BIM 360 toolbar, click  Models.
 Models. 
 models. Showing and hiding can help isolate models in the view.
 models. Showing and hiding can help isolate models in the view.  Transform.
 Transform. Tip: To align a model to another that has shared coordinates, copy and paste the coordinates.

 Adjust units. Specify units and click Ok.
 Adjust units. Specify units and click Ok.