Looking for a mod that merges craft files

[Finis]

Wasn't there a mod that let you merge two .craft files? so you could reuse launch vehicles with different payloads so you didn't have to rebuild it every time?

I forgot the name.

[flowen8]

http://forum.kerbalspaceprogram.com/showthread.php/30696-0-20-Subassembly-Loader-0-20-Compatibility-Patch?highlight=subassemblies

this should work, if you are playing on a low rez, you have to click of the very right corner of the jigsaw puzzle button in the editor, to add things to the subassemblies list.

[Finis]

That's it, thank you