[lammps-users] LAMMPS code

My name is Ferial and i am interested in LAMMPS.
My question is that if i want to modify the LAMMPS code to include the wetting,non-wetting phenomena by modifying the lennard jones potential to put infront of the attractive part of the lennard jones potential a parameter delta.How can i do that?
And then how can i invoke this new potential which i will call LJw indicating lennard jones wetting potential function in LAMMPS such that i can use it as a command like lj/cut and then i can write epsilon,sigma,delta and the cut off radius.
I will be of great pleasure to hear from you.