How to create/rearrange categories in VAB

[Waxing_Kibbous]

I'd like to know how to make a new category in the main categories bar in the VAB/SPH and move parts, as in remove from one category and place into another, into it. I've poked around some mods that kind of do it, eg Kerbalism (makes it's own unique category), but I'm not finding the appropriate code. My end game is to separate out plane parts from rocket parts, these tabs get way too bloated.

[SpannerMonkey(smce)]

Hi this mod does pretty much what you require.

 

[Crzyrndm]

Or if you want to do it in code yourself, primary category creation is here and deletion is here

Edited May 1, 2017 by Crzyrndm

[ShotgunNinja]

In addition to what already said, you could take a look at PartOrganizer. You can use that mod directly (see Adding a category example in its OP), or even mess with the minimal source code here (relevant logic is in PartOrganizer::setup() method).