Really appreciate your reply!
I didn’t know about clicking the corner and dragging it. Awesome.
Copy/paste is more nuanced, it seems. I had tried copy/paste before posting my question but it didn’t work for me. Now I notice that it does work when I highlight the new cells using shift + cursor keys. But if I select the new cells by clicking and holding and dragging the mouse (the way you can in Excel or Google Sheets) then copy/paste doesn’t work. For me anyway…
Thanks again for solving this for me. You’re going to save me a lot of time.