Add column value to a CSV through a script depending on anther column

I have an csv file that i would like to add another column (R) to. I need it to be dependent on the value in the 6th column (F).

If F=1 I need R = 1
If F=2 I need R = 2
If F= (anything else) I need R = the value in column E

I am attaching an example of the kind of CSV i am working with.

Normally i would have focused on trying to find an VBS that would do this, however my last question was answered with a batch file that worked perfectly. However I am not sure which way is best in this instance.

I am hoping someone can steer me towards a solution or example of something working with csv files in a similar manner.

Thank you,
example2.csv
sattermcAsked:
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oBdACommented:
How about this?
@echo off
setlocal enabledelayedexpansion
set CsvFile=example2.csv
set OutFile=example2-new.csv
if exist "%OutFile%" del "%OutFile%"
for /f "delims=" %%C in ('type "%CsvFile%"') do (
	set Line=%%C
	set Line="!Line:,=","!"
	for /f "tokens=1,2,5,6 delims=," %%a in ("!Line!") do (
		set Col1=%%~a
		set Col2=%%~b
		set Col5=%%~c
		set Col6=%%~d
		echo Processing !Col1!, !Col2! ...
		if "!Col6!"=="1" (
			set NewCol=1
		) else (
			if "!Col6!"=="2" (
				set NewCol=2
			) else (
				set NewCol=!Col5!
			)
		)
		>>"%OutFile%" echo %%C,!NewCol!
	)
)
echo Done.

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