Anyone know how to 'split' keys in the graph editor?

I have an animation for a character and I want to insert a hold at a particular frame - basically 'splitting' all the keys for all selected parts of the character at that frame and moving / dragging the second half of the all keys in the tracks to the right side of the graph editor so i create a space in between the 2 keys of the same value.

is there a way to do this quickly?

any comments appreciated much thanks