I have removed/deleted a category inadvertently. How do i bring it back?

Hi there, grandhivecoffee.

I'll share steps on how to bring it back the deleted category.
 

I suggest visiting the Audit log page to view the list of deleted categories. This way, you're able to see the detailed info of category and manually enter it back to the list.

Here's how:

1. Go to the Gear icon and select Audit Log.
2. From the Filter drop-down menu, select the appropriate user, date, and event(s).
3. Select Apply.
4. Locate the deleted category.
5. Under the History column, select View.
6. All the information needed for the transaction can be found under the Event column.

For additional information, you can click this article: Use the audit log in QuickBooks Online.

Once done, you can now manually re-enter the category with its original transaction information. Please follow the steps below.

1. Click the Sales menu at the left panel. Then, select Products and Services.
2. Choose the More drop-down arrow and select Manage categories.
3. Hit the New category button and enter the name of the category. Note: If you need a create a sub-category, select Is a sub-category checkbox and the main category.
4. Click Save.

You can check this article for further details: Group your products and services into different categories. This also provides information on how to add an existing product or service to a category.

Please refer to this article to see steps on how you can merge duplicate items or remove unused ones in QuickBooks: Remove or merge a product or service.

Let me know if you have other questions related to QuickBooks. I'm always here to help. Take care!