Add Attribute to CAD Documents

Is there a way I can add the attribute into our start model without having to do it in Workspace?

I.e., We have to assign a CAD TYPE attribute to our CAD Documents. 

The CAD type attribute is currently done in the WORKSPACE.  Once the attribute is added I can see that it created a parameter INST_CAD_TYPE in my model.   I tried to add the same parameter in my CAD model and even designated.  But it won't show up in my WORKSPACE.

Is this a Windchill task only?