When you want to express that something pertains or relates to a certain entity or subject, there are numerous synonyms for "applying to" that you can use. For example, "relating to", "pertinent to", "concerning", "regarding", "about", "connected to" and "directed at" are all alternatives that can be used interchangeably depending on the context. Each of these phrases can add a slightly different nuance to your sentence, so it's important to choose the most accurate and appropriate phrase for your intended meaning. By incorporating synonyms for "applying to" into your writing, you can add variety and depth to your language and make your writing more engaging and informative.