If I copy from an external editor to Mathematica notebook a block of lines (with a code)

line 1
line 2
...
line n

then whole text is copied to a single cell. I can now use n-1 times "Divide cell" and manually create n new cells for each line. If n is big, then this is a hard work. Exists some better method how do it ? For example before coping insert some special characters into text (representing an end of cell) ?

If I copy from an external editor to Mathematica notebook a block of lines (with a code)

line 1
line 2
...
line n

then whole text is copied to a single cell. I can now use n-1 times "Divide cell" and manually create n new cells for each line. If n is big, then this is a hard work. Exists some better method how do it ? For example before copying insert some special characters into text (representing an end of cell) ?