Store Locator Plugin Guide
How to Update Existing Store without Deleting it?
To update your existing store's data, please follow the given steps.
Export your data through "Import/Export" Stores with the checkbox enabled "Export with Store IDs".Image of Export Store ID Checkbox
Once you have the exported excel sheet, do the required modification in the data. You can delete those rows which remain unchanged.
Once the changes are done, upload the excel sheet, and import it.