Continuing the discussion from Push & pull tool:
Make the geometry you wish to save for future use into a Component.
Then … Right Context Click on the Component > Save As to save the Component to a local directory.
Context Menu Items for Entities - Save As — SketchUp Help
This context menu item is available for the Component entity.
The Save As menu item is used to save the selected component to a separate SketchUp file, with a new name and location in your file system. This menu item is commonly used to create component files that can be included in the component collection or reused in other models.
Thanks Geo, you made my life of designing much easier, Thanks again