Geometry optimization

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Dear all,
I need to perform geometry optimization on a large molecule (about 300 atoms).
I would like to work with internal coordinates, keeping most of them fixed and allowing only some of the distances/angles/torsions to be varied. I have input coordinates in cartesian form, so I guess that first I need to generate a Z-matrix.
Is there a way to give as an input only the interanl coordinates that I want to optimize?

Thank you
Alessandro


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