How to create snippets for HTML and CSS in webstorm and how to edit multiple lines at once?

So I have just installed webstorm. I have snippets in sublime text 3 build 3126 which I would like to pass over to Webstorm and use freely in Webstorm. The second question is how do I to edit multiple lines at once. So let's say that I want to edit line 2, 5, 12, 18 and 22 of my index.html file. How do I edit all these lines at once without having to click on every single line to make that change?