I am wondering how do I sync renshu kanji list to study on kanji in context, the textbook and workbooks? Is there some way to cross reference kanji from one to the other?
Not sure if this is what you are looking for, but some users have create Lessons for "Kanji in Context" vocab, and kanji. So, if you want study schedules based on those lessons you would be following those books.
(Learn(top bar) -> Master Schedules -> Settings(top right) -> Make a schedule -> Add Study Materials -> search for Kanji in Context -> Schedule all (for the one you want))