Maxsurf structure

Hi every one ..I have a question /suggestion about the structure module of maxsurf ..in fact I wonder why there is not a possibilty to create a longitudinal frame with the same way of creating a transversal frame .. sometimes its very convenient but unfortunately there is only stringers or girders but this is not why i seach !

Regards

 

I understand that a "girder" is the same as a "longitudinal frame" and can be "bottom girders", "side girders" of "deck girders". But, whatever name you apply to each element, the important thing is the cross section that it has and its resistant module (first moment of its area)

 

Thank you for answer
I understand that use of girders but sometimes for example when you want to draw longitudianal part between the transom and the first frame same of the shape of a transversal frame or a deck It's not possible with the use of guirders separates..