Applying Styles affects whole paragraphs. Is there a way to apply styles to parts of paragraphs?
If you want half a paragraph to be different (e.g. bold, italic, small caps.) you have to apply the effects, as changes, to the selected words. PageTools 2.0 (a VERY useful plug-in, now only available secondhand) included a feature to apply similar definitions to whatever is currently highlighted. If you hold the shift key as you apply a style, any local formatting will be retained, so, if you can make one word bold for instance, and then apply a different style. If the style applies a format such as bold to the whole paragraph in such a case, the local format bold will toggle and so will not be bold.