I have a expansion set in my closet that I bought in probably '94-'96 that starts around '40 and has rules for how and when Russia and US enter the war. When Germany takes France, you roll a die to determine whether French territories + troops are either Vichy or Free French, and whether the French Navy is Vichy, Free or scuttled. ( I think the Free French are played by the UK). Haven’t played it in years. I think it was by Xeno Games and called “The World at War”. Also had destroyers and some other cool changes.
New units
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Where to buy new kind of units? I want also a description of the unit like attack defense andfeatures
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Check this site: http://www.historicalboardgaming.com
There are no rules for those extra units. You have to make them yourself. But then you can better go to the forum for house rules.