XF 1.5 Copy another style properties?

[Blast]

Is it possible to copy the styles of my current style and transfer it to another style? They both have the same parent style.

 

[Martok]

If you are wanting two styles which have many of the same style properties and are both children of the same parent style, you'd be better creating a child of the parent, making the common style property changes there, then making child styles of the child style (and in those changing the things that are different).

This is covered in this guide:

https://xenforo.com/community/resources/proper-theme-installation-upgrading-and-usage.2942/