Word document provide input data which consists of a varyable number of lines
ending with paragraph mark and manual line break. Attepmting to copying the
input data into a merged cell results in "Data on the clipboard is not the
same size and shape as the selected area. Do you want to paste the data
anyway?" On clicking "OK", the paste fails with an error message "cannot
change part of a merged cell".

Can the line endings (including paragraph character) be converted into
Alt-Enter which Excel supports for manually entered multi-line data in single
and merged cells?