Create dropdown data validation

Build a dropdown in cell D2 on the Orders sheet listing the active sales regions: North, South, East, West. Validate entries so anything outside those four options is rejected, and apply the dropdown to the entire Region column D (D2:D1000). Confirm that attempting to type Central produces an error message.

Before I publish the order entry sheet to the reps, make the region selector foolproof: create a named range Regions with North, South, East, West on a hidden sheet, apply data validation to D2:D1000 referencing that named range, add a custom error message that tells reps to pick from the list, and conditionally format any existing invalid entries in column D with orange fill so reviewers can find them fast.

I added a dropdown but reps still type Region names like Central or Intl. That creates messy joins later and Ops will flag me. I don't know whether I should restrict input or update the allowed list. What is the most defensible immediate change to stop bad entries without blocking legitimate new regions, and how do I communicate it to the sales reps?

Over months the Region column accumulates variants — North, N, north, North-East — and lookups fail across reports. This costs me repeated clean-up time and breaks dashboards. What data-entry and validation habit should I adopt, and what sheet-level controls and simple governance steps will enforce consistent region values across the team?