Campaign - How to build new factory making existing engine?

I have 3 factories making cars that use the same engine. I’m falling short on engines and need to make another factory. I try to make another engine factory but the screen to select an engine, ‘Choose Engine Variants To Produce In Engine Factory 4’ has no engines to select. Why?


Which game version are you playing, openbeta LCV4.0 or the default LCV3.7?
Are you trying to make the factory from the factory manager in the main hub or via a facelift?