are you meaning manually fold in the mirrors or electricaly?
To manually fold them you pull them in by hand
Electrically there is a small square button on mirror adjustment switch
It would have an option when the car was orderd.
If you have electric folding mirrors there will be a small square button next to the mirror adjustment switch.
Just so you know the mirrors turn upwards not really fold inwards.
"i want to know does the 330ci come with this function because i cant manually fold them in but i dont know how to do it electrically"
I will find out the fuse number for you.
meantime check all the fuses behind the glove box with a test light or visually.
I have managed to sort you out a fuse card.
I will email it to you if you want.
The fuse for the mirrors is number 57
Please click accept and a feedback / bonus for finding you a fuse card would be greatly appricated.
Many thanks Phil..
can i have your email addresses then please .