I have a list of customers here and I want to find only the unique ones they've bought for me multiple times, but who bought for me only one time. We're gonna go up to format , go to conditional formatting . select the format . Rules are custom, formula is room. Type in count If a colon a, a one. N parentheses equals one. Make sure that the applied arrange is a colon A, Now we can see everything that only has one in a column is highlighted. Here's Moana. She's only. Bought from us once. Chris, once Sam, once Jamie, multiple times.