The WPSLP Power Add On or MySLP/Professional plan allows you to import CSV files with several options. View the information under SLP/Locations/Import . You have various options to consider when determining how to update locations that match your pre-existing locations.
Options available on how to handle duplicates: Choose to Add, Skip, and /or Update.
Location Imports are handled via a CSV file for users that signed up for the MySLP Professional service or are using the WPSLP Power Add On. With MYSLP the import feature is under the StoreLocatorPlus sidebar/locations as shown in screenshot. If you are using WPSLP self managed and have the Power add-on it will look similar.
CSV Import Format
Getting the proper CSV format can be a challenge when using spreadsheet apps like Excel or Numbers. Here are some tips to getting a valid CSV format out of a spreadsheet app:
Make sure you always have a header row. That tells the import process what data is in each column. The column headers have meaning, so be precise.
When a cell is a text field that STARTS WITH A LEADING ZERO, make sure you explicitly mark the cell as text. The easiest way to do this is to type a single apostrophe then the number when adding data to the cell as in ‘01886 for the zip code 01886.
Always export with UTF-8 support enabled.
Export to a CSV format. Comma delimited not tab delimited and quoted strings if given the option.