@Kao Try putting placement restricted by factory to true.
Add <option name="canProduceXunits" value="100"/> to your factory.
Then add <option name="unitProduction" value="100" to a territory in territoryAttachments.
There's probably a way to do it w/out having to do that to all TTys. Idk. But having the "placement restricted by factory" is set to true it will override "original factory".
This is a good place showing all the properties link text