A1 contains one line.
B1 contains one line.
C1 contains one to many lines.
D1 contains two lines.
E1 contains one to many lines.
F1 contains one to many lines.

Now do I paste multiple lines into one cell?

How do I make all cells have the same height as the cell with the most lines?

How do I center vertically the contents in the cells that have less than the most lines?