how to use rover design in factory

[SimonSyz]

ok I built a nice rover and now need to shoot it to the mun I also have a nice transporter design. The question is:

Is it somehow possible to "load" the rover design to my transporter design or do I have to rebuild the rover in the transporter design?

I new to the game do you have any addon suggestions?

[Awaras]

This mod lets you save parts of your rocket design for later use and copy whole assemblies from one rocket to another:

http://kerbalspaceprogram.com/subassembly-saver-loader/