Local Axis Node Restraint in RAM elements

Hello everyone, and thank you in advance for any help that you might be able to give me. 

 My question is pretty basic, and the post title explains it all.  Is there any way to change the axis uppon which your restraints act upon for a given node.  My problem is that I have a circular steel tank truss system with the trusses spanning radially from support to center, and I would like to allow for movement in the plane of the truss but restrict movement out of the its plane. 

 Currently, it seems that I can only make restrictions using the global axis system. 

Thank you very much!

AEM