Help with formatting, styles, script mode

Hi all,
I’m a little confused on how to use styles and script mode and don’t understand how to retain the style in portion of text (words in bold or italics) when using styles or script mode elements. An example:

Lorem ipsum dolor sit amet, consectetur adipisici elit, sed eiusmod tempor incidunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquid ex ea commodi consequat. Quis aute iure reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint obcaecat cupiditat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum

Let’s say I copy/paste this paragraph from the web and I want to format with my style for quotations (specific ruler, smaller font, justified) but when I apply the style, italics and bolds disappear…
is there a way to awoid this? Am I clear?
Thx
Nestor