There solutions are very dependent upon your data structure and which version of Excel you are using. So without more detail, we cannot offer anything more than very general help.
Note that Excel does have a built-in "remove duplicates" functionality. So it may just be a matter of copying your data to the other sheet and applying that functionality.
If you require more assistance, please provide more detail, such as some sample data and expected results.
MrExcel has a tool called “XL2BB” that lets you post samples of your data that will allow us to copy/paste it to our Excel spreadsheets, so we can work with the same copy of data that you are. Instructions on using this tool can be found here: XL2BB Add-in
Note that there is also a "Test Here” forum on this board. This is a place where you can test using this tool (or any other posting techniques that you want to test) before trying to use those tools in your actual posts.
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