Rocket/Space Plane attach?

[The D Train]

Hey everyone! I've been creating monsters all night and I have an issue. I'm trying to attach a spaceplane a made to a rocket I created in the VAB. I haven't figured how to do this yet. I've tried importing or merging both from either the VAB or the SPH and they just will not attach. I've tried using sub assemblies as well. Perhaps I'm just using subs incorrectly. Anyone have instructions on how to do this? Thanks

[micr0wave]

when you want to use subassemblies make the attachment node the root part, drag it into subassemblies and 'import' it to your other craft. The subassembly will only provide that one node for attaching so make sure it's the one you want.

[TheXRuler]

Place some random part (e.g. FL-T400 Tank) on the node that you want to attach to the rocket. Use the Root tool to set that tank as the root part (click on any part, then the desired root part) and grab the entrie plane without the root part. Save it to subassemblies. Go to the VAB and load your rocket, grab the subassembly and attach.

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Ninja'd