Is there a way to copy/paste keyframes to a extrapolation cycle? I want to make all the keyframes appear like this 

instead of the blank cycle like this 

Is there a way? I want this because sometimes I need to make change on the cycle and without keyframes, a single new keyframe will ruin the cycle. I really dont want to copy/paste all keyframes on the dopesheet because everything will be a mess and will take too much time!
thanks
This can be done with F-Curve cycles modifier. The F-Curve modifier panel is located in the Properties region in the Graph Editor.

To add a modifier, select the curve you want to add cycles to, select Modifiers tab in the properties region, click on Add Modifier and select Cycles.