When I copy a wide cell L15 from worksheet US_CA, my SUMMARY worksheet's
narrower cell H15 only shows the first few words of the text. I need to see
the whole text with line wrap in my summary cell.

Here is what I use for cell H15 in my SUMMARY worksheet:
=IF(US_CA!L15="","",US_CA!L15)

How can I create a line wrap so that the receiving cell expands horizontally?

Thank you.