[MacNNUK]

I save a lot of web documents as PDF's these days, to save on paper printouts.

I used to preview, then save requisite pages. A bit long winded.

I have found an (undocumented ?) feature of Preview I really like.

It is much quicker to print the whole web page(s) as a PDF, then when opened in Preview (as my default for PDFs) any unwanted pages are easily deleted by the  backspace command.

Now I would like to be able to delete parts of pages as easily.

[JKT]

Leopard introduced the ability to delete and rearrange the pages of PDFs so no, it isn't undocumented and it works for any unprotected PDF.