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.
If you are getting the message “you do not have sufficient permissions to access this page” when trying to access the “Manage Locations” or “Map Settings” page, but “Add Locations ” is working it is because another plugin is interfering with the submenu management module in WordPress. You will likely find that any plugin that has a separate sidebar menu with multiple entries underneath will only work on the first entry. There is little we can do to remedy the situation without risking breaking other plugins. We suggest deactivating other plugins, one-at-a-time, until you find the plugin causing problems then ask them to rewrite their menu and submenu process and admin panel filters to ensure the basic menu system remains intact.
