I thought if I went into my Calibre Library and created a second folder for my books I could then move all my folders across into that!... leaving the original Library for hubbie's books.kAm I making sense!
Makes sense to me. In Calibre, go to Calibre Library and select Switch/Create Library. Choose the folder on your computer/hard drive, then choose Create an Empty Library at New Location, and check the Copy Structure box if you want it to look the same as your original. Then in your original library, select any books you want to move to the new library, right click and choose Copy to Library, pick the new library and be sure to select Delete after copy so you don't have the same book in both libraries.
Let me know if you still have questions. Hope this helps.