Styles preserve selected text, font and paragraph styles for later use.

To copy and paste font and paragraph styles, select a portion of text and chose 'Copy Selected Style' from the 'Styles' menu, or press F5. 

To preserve letter casing or capitalization, select a portion of text that represents your choice.  If letter casing is not important, simply place the caret, or cursor, within the selection.  Note that 'Sherlock' is selected above.

Select the portion of text you wish to change.  Note the 'doctor watson' selection below.

Choose 'Paste Style' or press F6 to change the style of the selected portion of text.

Notice that the 'Doctor Watson' selection has not only changed its font but also its capitalization.

Styles can be pasted repeatedly without having to re-copy.  Style Copying not only preserves font and letter casing, but justification, highlighting, numbering and paragraph offsets.

Styles can also be pasted between different documents and windows.