Parent each door object (door 1, door 2) to the cupboard frame.

Change the rotation centers/endpoints to accomodate desired rotations (making sure center and end values are aligned x and z axis) for each door using the joint editor.

Rename each Y rotate parm dial for the doors (little triangle opposite relevant dial, settings) to open/close. Set min limit/max limit values (+/-) to taste via same. min 0.00 fully closed/max -180.00 fully open for example (test to find preferred values).

Save as prop to library using select subset option. Click universe checkbox to clear hierarchy. Select frame and both doors, name, save.

Open saved .pp2 in text editor, locate renamed rotation dials (rotateY yRotate) in file, locate setting 'forceLimits' change value from 0 to 1.

Extract/remove embedded geometry .obj info (you can just copy the entire .obj block and paste into a blank .txt file renaming extension .obj if you're experienced editing groups etc in .obj), place .obj file path reference to geometries folder (goes where the .obj block once was, look at another open .pp2 to see exactly), place .obj in geometries. Save edited .pp2.

You'll probably want to do some other stuff like hiding dials, etc.

...in case that tutorial doesn't cover something, I didn't look. Just ask if you run into any snags.

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