Miror copie

Hi,
Is there a way to copy a pan with invert position.
for example i have fix 1 pan 20° and i want to do a copy of fixture 1 to fix 2 but result should be -20°.

Other question, can i add or remove a value to a parameter, example Fix 1 is at 100° and i want to remove 360° of this 100°.

thanks
steph
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