If you want to set a blueprint property like a multiple list you can use a bit mask.
UENUM(Meta = (Bitflags, UseEnumValuesAsMaskValuesInEditor = "true"))
enum class EColorBits
{
ECB_Red UMETA(DisplayName = "Red"),
ECB_Green UMETA(DisplayName = "Green"),
ECB_Blue UMETA(DisplayName = "Blue")
};
UPROPERTY(EditAnywhere, Meta = (Bitmask, BitmaskEnum = "EColorBits"))
int32 ColorFlags;