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

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Dear mr tomazsabec
tank you so much
best regard