Merging/De-Duping

Welcome to the forum.

Most of us have done this 1M different times in 1M different ways, as each time the data and logic needed is different.
YOU need to identify a way to determine what IS and IS NOT a duplicate, then use formulas to flag the duplicates and delete them.
We can likely help if you provide a sample dataset and show us how you determine what is a duplicate.

Attach a sample workbook. Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate. Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data.

Click on GO ADVANCED and then scroll down to Manage Attachments to open the upload window.