copy and mirror sketch between opposing faces

[TLS]

Hi, I'm designing an enclosure for my Arduino-(3D print); composed out of top lid and botom part.

The top part has mounting studs, creaded from padded sketch. I would like to copy and mirror the sketch from the top part so I can have aligned studs on the bottom part. But I didn't find a function for that. Rotating a sketch around it's axis doesn't seem to work. When I enter rotation value and axis, it rotates, but it jumps back to it's original position when I hit apply or ok. Before I try to rotate I removed constraints linked to XYZ axis from sketch...

Only solution I found was to copy (without members) the sketch as it is to the outside of the bottom face, and pad-inverted- 'through' the bottom lid to have the same studs facing towards the top part. This is a bit 'dirty fix', because when I change the thickness of the bottom pad the studs have wrong dimensions.

Thank you for your help

OS: Windows 7
Word size of OS: 32-bit
Word size of FreeCAD: 32-bit
Version: 0.15.4671 (Git)
Branch: releases/FreeCAD-0-15
Hash: 244b3aef360841646cbfe80a1b225c8b39c8380c
Python version: 2.7.8
Qt version: 4.8.6
Coin version: 4.0.0a

[microelly2]

You can only move "initial" sketches which are not ceated on faces of earlier pads/pockets.

You can make a copy of the sketch of your studs,
then detach this sketch from the basis pad and move it to the right position and modify it and pad it from there.

another way:
you can make a draft::clone of the sketch and move this clone.
the clone will change automaticly when you modify your original sketch.

[TLS]

YESS! it works.

If I attached the sketch of the studs to a face, the rotation was lost.
I had to pad the studs without the sketch being attached to a face. I created the bottom plate by creating a sketch from the stud surface

Thank you Microelly2