Vertex Painting

Heys guys.
I have been making a level in the UE4 and I finished a 3D model that I need to paint with 4 different textures.
How can I combine them together and paint them into one static mesh?
I have already watch almost all the videos on youtube that talk about vertex painting but none of them was working or didnt fit in with the 4 textures.

Thanks for your help.