# What happens when I select Rewrite?

Rewrite will delete the old numbers and add the new ones from the CSV file you have uploaded.

* If your CSV contains existing and new numbers, only the new numbers will be listed, and existing numbers will not be delisted. 
* If there are existing numbers from different feature sets, they will be remapped to the currently selected feature set, based on the CSV uploaded.
* If your CSV contains only new numbers, they will be listed.
* If your CSV contains only existing listed numbers and no new numbers, there will be no change to the feature set's publish state.

**Here are a few conditions to note when using Rewrite:**

1. If you use "Rewrite" with numbers from another feature set that you have access to, the numbers will be listed and delisted from the other feature set.
2. If you use "Rewrite" with numbers from another feature set that you don't have access to, access will be restricted for those numbers.
3. If you use "Rewrite" with a mix of numbers you have access to and don't have access to from other feature sets, the numbers you have access to will be listed, and an error will be shown for the numbers you do not have access to.


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