Rhino model +sofimsha

HI everyone
After transferring my model from Rhino to Sofistik , and then I want to add elements to the model using SOFIMSHA, for example, I want to add two springs to both sides of the model, but when I do this, the Rhino model is removed.
How to use Rhino and water model at the same time,( for example, import model from Rhino and springs from SOFIMSHA)

tanks very lot



Dear mr tomazsabec
tank you so much
best regard