ZBrushCentral

Problem with subtools assiging materials.

Hello! This is my first post!

I’m hoping to post some work soon on this amazing site, however I have a problem when texturing my models. I have a head model and a separate sub tool of a pair of eyes which I want to add a toy shader to and an eyeball texture. However whenever I add the shader to the eyes it adds them to the head as well. I thought that they were treated as separate objects/models and it wouldn’t do this? Is there a simple setting I need to change? I have the eyes highlighted in the sub tools palette and not the head. I’ve even tried onlt having the eyes visible but when I make the head visible again it has the toy shader on it. Thanks in advance for any help with this.