Is it possible to make a link directly to sub categories?  I know I can add ?cat=something to link to a main category, but is there a way to get directly to the sub category?

Thanks 

Hi Chris,

The answer is yes.

You can configure an additional Xmod Filter by URL parameter for the SavedSubCategories form field and pass the sub category value in the URL string.

Reference:

How Do I Add a Linked Category Dashboard to XMod?

Buck