How to insert keyframe only "Available" in blender 2.78? There used to be a feature in insert keyframes pop up menu (press i). 

Where is it now or how to achieve that in new blender 2.78?



This image is from internet i dont know which version of blender is this screen shot from. But this clears what i am looking for
The available function is still there.
It does require a pre-existing keying set to add keyframes to.

In this example there are no keyframes (therefore no keying sets)

Once I add a keyframe for location, then you can add more keyframes to that set with available.