P.M. wrote: Is there any way I can delete the text from a specific point of my text frame to the end of the text (including the text in linked text frames)?

Yes, indeedy! A close inspection of the InDesign Keyboard Shortcuts Chart tells me that Command/Ctrl-End moves the cursor to the end of the story, even the end is a hundred pages of linked text away. Just add the Shift key to get Command-Shift-End (or Ctrl-Shift-End) and you’ve just selected from any point in the text to the end…