change default sidebar on one category of the menu

Hello everyone!

I decide to make a new category for my menu. In this category i don’t want to have the same sidebar of the other categories of the menu. The problem is that in my Theme (Presso) i only can put a default sidebar for all the categories of the menu.

There is a code where i can change in only one category the sidebar?

Thank you so much in advance.

jordi.