Phil, I recommend contacting a qualified RMS partner for help with the system set up and roll out. Much of my work is fixing systems already installed, which is more difficult than setting it up right the first time. Many have been installed by partners who don't specialize in RMS.
each store - RMS store operations + HQ client warehouse - RMS store operations + HQ client
HQ server is an application that needs LAN connection (or same PC) to the HQ server box. This appplication transfers communication through the HQ client application at the stores.
HQ manager needs LAN connection to the DB server or remote desktop to the LAN. PO's can be generated at the store manager level for a specific stores order
- in your case warehouse, or at HQ manager with worksheet 340 for any store.
In either case the warehouse would receive the PO's and issue transfer's to the stores.
Good luck!