This is a simple tip how to add and organize POIs:
1. Create some directory especially for download. I use the following one: C:\Garmin_POI_GPS_DATA_TEAM
2. Download and save all CSV and BMP files to that directory. You may create any subdirectory and use it to save POIs for that category.
3. Garmin's POI Loader will find all files in these subfolders and will use them to create a category.
Garmin POI Loader will search through the directory C:\Garmin_POI_GPS_DATA_TEAM and will create/transfer all corresponding POIs to your connected GPS.
4. You can remove any POI file simply by removing it from your POI folder and re-running the POI Loader software. This POI update procedure takes about 1-2 minutes.
In summary, keep your POI files updated on your PC and run POI Loader to update your GPS or SD card via any SD card reader.