@deva1984 - This is what I do for that sort of situation, I prefer having all versions of the same 'book' together
- Add the book using the best for kindle PDF, get the title and author as you want them
- Rename the best for PC version as <whatever>.pdfpc, associate pdfpc with your desktop/laptop PDF reader, add this file to the book created above via Add Books->Add files to selected book records
There may be calibre functions you can't perform on the
pdfpc file such as send to device and convert, but that doesn't seem like it will a problem for you
Suggest you try it out on a test library to see what it feels like
BR