How to add new styles in phpstorm, and leave the old ones (a lot of css, scattered throughout the file)?

Question

css

There are styles that are in the scss assembly, when I integrate with WP I sometimes change the styles (these are compiled css styles from the scss sources) of some blocks. Then, for example, a new page came to me and I go further to the scss sources to typeset and now I need to insert new compiled css styles already with this page. But I changed the previous css styles.
Task: insert new css styles (with a new page) into the modified WP styles and make sure that the new styles are added and do not overwrite the styles that I changed to WP? How to do it in phpstorm? I saw when there is something like in git when merging 2 files that you can choose where to copy which lines, where to find it and how to use it?

Answer 1

Edit styles in a separate file called shame.css