Modelling DED additive manufacturing process with plugin AM on Abaqus

Hello everyone, 
I am trying to simulate the successive material deposition in DED with the Plugin AM on ABAQUS. To do so, I need to use progressive element activation but I can't find out how to ! Is there another way than subroutines? If not, can someone explain to me how to use/implement subroutines? 

Thank you in advance ! :)