Thanks for the note explaining about the child themes. The more I look at them, the more I think they are quite useful. Thanks.
Also, thanks for the advice on storing the pdf files. It is always nice to have my hopes confirmed. I created a separate folder for the pdf files within the upload folder and it all works well. I have no problem managing the pdf files using my FTP program which is Fetch. Been using it for many years and it works great for me.
Thanks again
Myron