Hi again Thank you for your help. So i think i will split the surface it 2 parts and work with it like this !!! Thank you

Hi folks. Method 1 1 - Open the model from which you want to use parts. 2 - Copy the parts that you want to transfer in the new model (select then CTRL-C). 3 - Open new model. 4 - Paste and then move to proper place or paste in place to paste at the same geometrical ccordinates they where in the original model. Method 2: 1 - Open new model. 2 - Import the SKP file of the old model to bring it inside the existing model. It will come in as a component. 3 - Edit the component and remove unwanted parts. 4 - If required, explode the component. Method 3: 1 - Load old model. 2 - Save a copy of the using File Menu --> "Save as ..." 3 - Draw the new stuff in this model. Just ideas.