|Tab: AGF Compiler | Create Texture Part|
This allows you to create a selectable texture part in the "Customize" Dialog, at "Select Textures Tab".
Select "Create selectable Texturepart", then choose a *.agf file and specify the Part Group and Part Name.
This means that all textures which are inside of that agf file will be selectable of every other TexturePack, aswell.
This doesn't change anything in the agf file!
The Part file can be found in the DR_DATA/dat/ folder. Filename will be: GROUP-PART_NAME.dat.
Referring to the Screenshot above, it will look like this in the Customize Dialog: