If you make the cabinet a component, you can save it as a separate SketchUp file using the Save As… context (right-click) menu. Then you can import that component into other models. To reuse it within the same model, just create a copy and place the copy in the new location.
If you can’t change the orientation, it sounds like the “glue to” behavior was set when you created the component. You can turn it off on a specific instance via the context menu item “unglue” (if that menu item is not grayed out. if it is grayed out the component is not glued so you must have some other problem). You can also turn it off for all new instances by opening the components window, selecting the component for edit, and setting the glue to selection to “None”.
The most reliable way to get an exact answer to a question is to upload an example model illustrating the problem. Use the upload button at the top of the reply window unless the file is >3MB. For large files you have to upload them to a file sharing site (e.g. 3D Warehouse) and share the link here.