Sentence examples for so in from inspiring English sources

"so in" is a correct and usable phrase in written English.
It can be used in a sentence to indicate a sequence, result, or consequence of something previously mentioned or discussed. Example: "I'm really interested in taking up photography, so in addition to my photography classes, I've also been practicing on my own." In this sentence, "so in addition to" shows the consequence of the speaker's interest in photography, which is taking classes and practicing on their own.