can any one help me out...? What is the short cut key for the flatten the sheet metal in solidworks sheet metal?
Strangely, that appears to be the only tool missing from the shortcut menu. So to answer your question ... there isn't one.
I suggest you submit an ER to add Flatten to the list.
As Kelvin stated that there is no shortcut for it but you can use this macro (Re: Flatten a part ) from Artem Taturevych and set a keyboard button to toggle flat pattern.
Why not copy the Flatten button from the Commands menu to the shortcut toolbar?
Like Deepak and Bernie said, or..........
Put it in your "S" key commands
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