This may be possible - but I can't guarantee it will work. There is a Contribution for osCommerce called Multi Stores. You may be able to port it to work with Zen Cart by changing certain definitions in the code e.g. tep_cfg to zen_cfg etc.

If the porting works then you'd have one main store with one database, and other stores all using the same database. There'd also be one admin panel, with different levels of access for different store owners, and different products for each store.

It's a big contribution but you could speed up changes quite quickly with using the Find and Replace function in a text editor like Text Pad.

Vger