Copy-paste is something that is on my to-do list, but it is not the highest thing on the list right now.
What you may try to do to copy and paste a style from cell B2 to H10 is this:
$xfIndex = $worksheet->getCell('B2')->getXfIndex(); // returns integer e.g. 5
Such methods have not been mentioned in the documentation and the above may or may not give the desired result. There may be complications if there are e.g. row styles and column styles.