[closed] Whats the right way to add a second OSM file to your Nominatim instance?

I've created a nominatim instance, run setup.php with the --all flag and imported one US city into it. I now want to add a second US city - whats the right way to do this? I referenced this post but run into the following dead ends:

a) Running import data leads to a hang where it says "Setting up table: planet osm ways"
Command ./utils/setup.php --osm-file <filename> --import-data

b) Running the update script results in an error where it expects an osc file:
Command: ./utils/update.php --import-file <filename>

Thanks for any help!