You can do it with the “Style” palette. First set up a title as you need it. Open the style palette, create a new group and add the current style to this group.
(I think there is a bug in Boris not saving your new styles where they belong. Exit Boris, search for the folder where your new style group has been saved, search for another, already existing style group and move your new style group into that folder.)
Now open up the next title, select your text and apply the style to the text. Make sure that you are replacing all the style informations by selecting all the checkboxes you need.