Re: Use NewCrossFitting() to connect four pipes which in different types,the new family instance of a cross fitting belong to which familySymbol?

1- let the user select the pipe whose the desired cross family type is defined in its routing preferences prior to hitting the tool button. 

2- extract the desired cross family type. 

3- do the NewCrossFitting()

4- use FamilyInstance.ChangeTypeId(desiredFamilyType.Id) method to change the created cross to the desired cross family. 

Hope this helps!