1、be fine with me 我无所谓
Whatever you think is fine with me.
2、give a damn 不在乎（用于否定形式）
He couldn't give a damn whether he passes the exam or not.
3、suit yourself 你随便吧
You don't want to join the club? Oh well, suit yourself.
4、It's up to you 由你决定
So if you really want this class to make a difference in your life, it's up to you.
5、I don't care 我不在乎
I don't care what she thinks.
6、do whatever you want 你爱咋咋地
I have no doubt about that. You can always do whatever you want.
7、as you wish/if you want 随你吧
As for your departments plan, you can change as you wish.
I have no idea how to file my tax return, whatever.