
Originally Posted by
lhungil
There are many tables (and relationships) involved. Not just customers_id, but other keys which will need to be updated throughout the database.
Keep in mind if you have any other "plugins" or "modules" installed they may have altered the Zen Cart database (and require you to make additional modifications)... You may also have missed some things when installing / merging the "multi-site" mod changes... Or when upgrading the database...
If you have not already upgraded both stores to Zen Cart 1.5 - This should probably be the first step... Trying to both "upgrade" and "merge two stores" at the same time will make determining the source of issues (and handling required database changes) difficult. Do one or the other first.
Unless you are comfortable with all the items mentioned as well as debugging when things go wrong... You may be better off keeping both these stores separate... Or hiring someone very experienced with SQL, Zen Cart, and the "multi-site mod" to handle the installation of the "multi-site mod" and upgrade(s) to Zen Cart 1.5.