Production

You can build ships in 2 styles: at your bases Production tab, or the Production Center (premium account required)

The Base Production tab allow you to select a ship type, it will be added to the list at the right, and there you shall inform how many units

You can build the same type several times, like in a batch

The production has options, that you can set to each new produced ships: to Delivery at other coord, to Auto Merge upon landing if you selected the previous option, to load Fodder automatically if you built ships that can carry fighters and similar units.

You can also pay double to twice as fast production.

The other mentioned page is the Production Center, it allow you to pick one ship type, and build it at all capable bases, each one as its own capacity and duration. Like 1k fighters at all bases that has at least Shipyards level 1.