Hi @shrutisingh, Another Post QuickSight (and most BI tools) being read-only, we cannot insert new rows of data (can only make new columns). I think this is where your question about doing UNIONS in the data prep is probably coming from? You are right that would be a solution to the latter scenario (to insert a row with a null or 0 value), but as other mentioned the only want to to a UNION is by using Custom SQL. Yes, we are looking at adding UNIONS into the data prep UI as well, but unfortunately we cannot comment on dates At AWS, our roadmap is primarily driven by our customers. Your feedback helps us build a better service. I have tagged this as a feature request.