I've built a rocket that will get the three kerbal capsule to orbit. Now I want to use the same rocket to get my custom built Mun lander into orbit so they can dock and head off to the Mun. However, I cannot figure out how to swap out the command modules. I thought this version 1.7.3.2594 was able to do this using the re-root tool. For the life of me, I can't figure out how to do it. I've tried every combination of clicking tools, parts, modules, etc, but nothing seems to work. I must be missing something because this seems like it should be three to four clicks max. Can anyone point me in the right direction?
Thanks!