App for converting all notes in Imac notes app to a single pdf file ?

Thanks for your reply.

I am not looking to combining multiple  files.  I  am looking to search within a single document/file that has many lines.

I want to search with a single search term  ( substring ). For every line the search term is found in I need the entire line to be selectable so I can copy all the lines found with the search term to another file or  be able to delete all the found lines from the searched file.

Note on my IMac Catalina  there are many Text Editors and Document Editors in the App Store   but I have no idea what can perform this task ?

As suggested I tried to call  Microsoft about Word but they dropped me when transfering me to the Tech Dept and then

closed on me.    I remember why I did not like Microsoft when I was working.

Thanks in advance for any help.

Dan