While it is true that you can simulate a basic Additive Manufacturing process using EKILL and EALIVE strategically, with select logic, I would not recommend this approach.
I would refer you, instead, to the MAPDL commands listed below. You need an Additive Suite License to use these commands; but, if you are serious about AM simulation in MAPDL, this is the way to go.
I would also refer you to the AM course material on the Ansys Learning Hub Ansys Mechanical Workbench Additive.
There is a chapter in this course entitled 'Mechanical APDL for Additive' that takes a deeper dive into the use of the above MAPDL commands.