Does anyone know if there is a way to modify the category fields when manually adding new links such that it works similar to the way of adding a new category? For example to add a new category you have two areas:

Category Name:
Subcategory of:

We have so many categories that it is becoming cumbersome to have the whole list when selecting the category for each link, so when adding a new link we would like to be able to have two separate lists to place the link in the correct category:

Category Name:
Subcategory of:

and then select the appropriate ones. If anyone has any insights on how this could be done it would be much appreciated!

-TCC