How to make a passage on the top of a door?

[AMATERASU :-)]

you know, so that the rope does not get jammed from the above. partial hanging.
whats the easiest and cheapest way to do the job
thank you boys

 

[locked*n*loaded]

Hammer and chisel???? You could use an electric rotary tool with a cutting bit, also. Also, you could use a file. You could use some type of small hand saw, too. Lots of ways. Not 100% sure why you need to do this, though.