@Manos
It seems a bit complicated to clone with S3D.
Although I worked with it for years now I always uses pack3D to clone units.
Maybe you try with S3D.
The following submarine folders are AI subs in WAC4.1:
-NSS_SclassUS
-NSS_SclassUS_sm
-NSS_Uboat_XXI
-NSS_Uboat2B
-NSS_Uboat7a
-NSS_Uboat7c41
-NSS_Uboat7d
-NSS_Uboat9b4
-NSS_Uboat23
-NSS_UboatRU
-NSS_X-craft
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