Is there a way to make 1 face use different parts of 1 texture image at the same time? (using transparent textures).
not sure but i would have thought using a second UVTex layer
He means a UV texture mapped image. as a posed to adding a texture through the materials tab.
im not entirely sure what you mean by 2 parts of the same texture.
there are ways to make a material use two textures, through a stencil. but im not going into all that cos I dont know what you want to do.