Perhaps a better and longer winded explaination of some game concepts slightly changed with the way that Crusade has changed Planetary Production.
When there was a planetary production wheel - you had three things you could do with Raw Production (still called Production in the XML files but now in Crusade it is sum of Production caused by Population plus any improvements - planetary resource tiles or buildings - that add to the Raw Production capability of the planet).
So you used to be able to "control" where the Raw Production was channeled:
A) Planetary Economy (Gross Income)
B ) Manufacturing (MaxManufacturing)
Then you had a SLIDER to determine whether the total amount of Manufacturing (MaxManufacturing) was directed:
1) Social Manufacturing (Manufacturing) - improvements or projects to be produced on that planet
2) Military Manufacturing (Military) - building ships in the associated shipyard
With Crusade it was decided that "Production Wheels" or +25 % bonuses to one of the three MaxProduction targets would be eliminated so now Production is split evenly and automatically into Planetary Economy, Research, and Social Manufacturing, Military Manufacturing (if you have an associated shipyard).
I have not tested to see if Raw Production splits evenly into the first three and then MaxManufacturing is further split evenly into Social and Military Manufacturing but I suspect that is how it is done.