haw can we make layer texture/shader for any fbx object/env in 5.1.1
want to know how to make Multiple layers shader /Texture in one network
You build and plug them all into a single material graph. Import some of the example projects from unreal and look at the materials they have built, or any market-content. Otherwise it sounds like you are new to unreal(?) or at least shaders/materials. For that Iād recommend hopping onto youtube for some basics.
You can build-up functional-style. If you wanted multiple things, effects or whatever, you just-write them. ULTIMATELY output has to feed into that big-node on the right, material attributes, but whatever maths you decided upon to generate that basecolor, or that specular value, etc is entirely up to you (arbitrary). The art is in what you choose to have influence here.
If you want multiple textures, texture-samples, or whatever, you can do that, but you have to put them there.
This was the video series I used when I first started learning shaders/materials.
Hopefully it can help: https://www.youtube.com/watch?v=nERpEOABJJo