I started some cuttings for roots in mid August using plastic cup then in polybag as before and everything went out pretty good from the beginning till 10 days ago, I found the leaves suddenly withered as per images attached for reference even most cuttings are still having some roots . I moved them from outside greenhouse to indoor about 2 weeks ago. Did I do anything wrong to make the leaves withered. Why this happened ? Do you thing that the involved cuttings can be survived or not ? What should I do with them for now ?

That's too bad.  You had nice roots and growth going. 
At this point there is not much you can do.

The soil looks too heavy and wet.  Cuttings needs much lighter mix more perlite 80/20.
It is quite possible the cutting rotted at the bottom. 

I would bare root the plant and check for rot. 
If OK then up pot to a well drained soil mix and add some nutrients.

It may be just the angle of the picture but I can;t see any holes in the pot bottom.
II agree with Pino about the look of the wet soil. Could it be that the humidity in the greenhouse helped it stay alive.
If it was due to the soil wetness, then removing the plant gently from the wet soil and replanting it in just moist soil; first placing moist soil at the bottom of a pot and placing the plant upright on it and gradually pouring in moist soil and then placing it in a humid and warm environment to give it another chance.

Hi Pino : Thanks for your helpful responds and looks like I made some mistakes by adding too much moisture and lack of air to kill mu cuttings. I did pull out one cutting this morning and found no roots and nothing. The cutting looks good and perhaps I will give it a try to re-pot again using more perlie and less mix to see what will happen. What do you think ?

Hi OttawanZ5 : I did place 2 holes in the bottom and 5 to 6 holes near the bottom but my biggest mistakes should be too wet and less air  inside of the cup and kill my cuttings. As suggested, I will try some to-morrow to see if I can do something to help them growing again. Thanks.............  The cuttings were giving to me by two nice members from this forum, now I let them down with sorry !!!

Cut off the leaves. Your soil looks soggy wet. It is going to rot soon. more perlite or remove entire twig and put it back in spag moss.

That's what I am going to do to-morrow afternioon as I need to buy perlite to-morrow morning
Thanks.............

I went through root rotting with one of my cutting a while ago. You kinda tell by the root color when it turn brownish. I end up cutting the rotting part of and start again, one of them die :(