How to add custom maps to The lost mission campaign

[DoomedSpartan]

Hey guys as you know I’m working on Perfected Doom 3 BFG Edition and Version 2 will be entirely based on adding the maps from PD3

 

I already added the main campaign maps from PD3 in the “maps_def”

 

I plan to at least one more Hell map to The Roe maps.Which it should be “d3xpmaps_def”

 

But I am really confused on what The lost mission map def file is called It can’t be the same one as The Roe campaign since It does not feature the The Artifact.

 

If anyone has any idea on what should I do or what the map def file is called plzz tell me.