StockbeamSuggested moves
Open Products and press Move stock at the top of the page. Move stock lists products that have plenty at one location and too little where they sell, with a suggested number to move. No move empties the location it comes from.
Send and arrive
Sending takes the units out of the first location straight away. They are in transit until you press Mark arrived, which adds them at the other end. That stops the same units being sold twice. Put it back reverses a transfer.