I am hoping to use an existing sheet with a new form to gather information. Currently, people should be completing certain fields on their own. What I would like to do, is that if they leave it blank (or by design, they don't see the field so it is left blank intentionally), I could use a formula to fill in information from another cell on the sheet. If they did complete the field, I don't want to override that information though. In the image below, the locator number column would be a field that would appear on one form to and people should manually enter a number there. Ideally, we would like to give a specific target audience a different form link. Based off of their response for APC Session Title, a specific APC Locator Number is pulled through using VLOOKUP. I would like to see if the number that pulled through into the APC locator number column could be entered into the Locator Number column only if it was blank. Is this even possible and if so, could someone help with the formula?