External tubes

Hello! Is there a way to build external tubes , which are only fed by external lockers? Is it possible to build tubes ,which are only loaded by the external reserves, but not by the internals?

By the way, i`ve found a way to make missiles act as missiles and not as torpedos : leave the torpedo as a node without 3d-model and make the model itself a child of that node.than one can install animation keyframes and make it rise at the start , climb and than dive at the final high. one yust needs to add a time e.g. 600 seconds to the last keyframe so the anim won`t restart in time. works well with my ECHO-II SSGN (4 seperate dual-launchers, eight P-6 cruise missiles.)