There's a better way to handle this than manually adding hundreds of rows, and it starts with recognizing that your spreadsheet already knows the pattern. You've got repeating dates, a clear sequence, and a rule that says the new row always follows the 11/15/25 line and lands every third position. That's not a tedious chore waiting to happen. That's a structure you can automate.
The trick isn't a single formula that inserts rows, because formulas don't insert rows. But you can use a helper column to flag every third line, then filter for those flags, and insert blank rows in bulk. Or, if you're open to a slightly different workflow, you can build a second sheet that references the original data and uses a formula like `SEQUENCE` or `FILTER` to generate the full list with the new dates already in place. For someone comfortable with basic spreadsheet functions, this is a ten-minute fix. For someone who's not, it's worth the twenty minutes to learn, because the next time this pattern repeats, and it will, you'll be done before your coffee cools.
What's striking about this question is how common it is. You're not asking for something exotic. You're asking for a way to stop doing repetitive work that a machine could do in a fraction of the time. And that's exactly the kind of problem worth solving at the source. The fact that you're even asking tells us you suspect there's a smarter path forward. Trust that instinct. Manual copy-paste might feel safe, but it's also where mistakes creep in. One missed row, one wrong date, and your entire tracking sheet loses its rhythm. Automating this step doesn't just save you an afternoon. It removes the risk of human error from a process that's supposed to be reliable.
So here's your concrete next move: map out the exact structure of your data, add a temporary column that marks every third row, filter to see only those markers, and insert your blank rows there. Then fill them with the new date. If that feels clunky, search for "insert rows based on pattern" or "automate repetitive row insertion" in your spreadsheet tool's help center. You'll find step-by-step guides that walk you through it. The pattern you've described is common enough that solutions exist. You just have to look for them. And once you do, you'll wonder why you ever considered doing it by hand.