What is a line break code for zoho?

What is a line break code for zoho?

Hi,

I am archiving data by adding values from a single line field from one form to a multi-line field in another form.

So I need a code/function that starts a new line on that multi-line field so it does not just keep adding it on the same line.

Example, doing something like this means that it will be on a same line.
archive.field1 = archive.field1 + input.Field1

I need a code so the input.Field1 can just start on the next line.

Instead of "value 1, 2,3,4,5"

It will be:

"1
2
3
4
etc.". 

something like: archive.field1 = archive.field1 + {new line code here} + input.Field1