Combining two saved "ships"

[DJRWolf]

There is the stock equipment like the station core and ion probe but I was wondering how I would go about putting them on top of a booster I downloaded that has an empty spot at the top for a payload. Or do I have to build a rocket under them myself?

Edited January 6, 2014 by DJRWolf

[Kasuha]

If that booster's empty spot is on the booster's root part (i.e. the part by which you can drag the whole booster around by left-click without shift), you can save the booster as a subassembly. Then load your part, load the booster subassembly and stick it below your payload.

[DJRWolf]

I could not get the payload (in this case the core section of a space station) to save as a sub-assembly but I was able to get the pre-built "T-9" booster I downloaded to save. Trouble I've been having since then is it skips to the last stage after the first stage is done. I manged to get it to stage right once but I goofed on the MechJeb autopilot setting and had to revert. Now I just need to un-derp the staging. Thank you

[Kasuha]

If both your booster and your payload have stages, you need to create enough empty stages in the staging column before you attach the subassembly to prevent them merging in a strange way.