I was trying to update the choices available to be selected in a sharepoint list based on a value in a different list. For instance, I have the values 1,2,3,4 in list 1. If I add a row to list 1, there are now 1,2,3,4,5 in a certain column. I want to update the choices to be updated in the first list.
I agree with moe, that sounds alot like you are talking about lookup columns, https://support.office.com/en-us/article/create-list-relationships-by-using-unique-and-lookup-columns-80a3e0a6-8016-41fb-ad09-8bf16d490632