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britesc - There's a little down arrow glyph on the left of the Add Button, click on it and it will show a menu of sub-actions, the
Add Empty Books (book entry with no formats) one is what most of us use for paper books. Or you can just add an empty text file by dragging it into the book list, then enter the Author, Title etc, then you can remove the text file.
You'll also see an action for adding a books by ISBN.
If you want a Location for your physical books, then that would be best done by a custom column - maybe a fixed set of values - Main Office, Rack, Shelf, etc .
There's a column (field) named IDs, it can contain ISBN, Amazon, B&N, Google etc identifiers. Theres also a plugin
Extract ISBN (
← click). It will look inside ebooks for an ISBN and pop it in the IDs column for you, its a good thing do before downloading metadata.
In case you've not realised it yet - calibre is primarily driven from a database, not the file system, the latter is used a container for ebook files (EPUBS, PDFs, TXT etc), cover images and
odp opf files (these are a means of rebuilding the database should it get lost or corrupted, they are not used in normal operations)
BR