mhm What do you mean with the main System? Maybe the live gameworlds?
because PTR and Live gameworlds are completely seperated from each other. So if you have a production sereis already bought on the live Servers, you don't have it on PTR and the other way.
Also: There are some difference in the "Standard" production series in different Scenarios.
On the USA (american Dream) Scenario you have other production series free to use, than on europe or classic e.g.