Reduce number of textures

Is there a parameter to set to reduce the number of texture files

What do you mean by this?

i mean the png fexture files there are about 16 of them other software you can define 1 or 2

The textures for the 3D model (.obj)?

yes

Can you help me understand what the need or benefit of this would be?

What problems does this solve?

Why is it helpful/good?