If you mean to fix all backbone torsions, I can send you some of my scripts that can add this to a topology file. Kindly let me know if you are interested.

Thank you so much Zoltan. I will appreciate if you can send me the same? Is it also possible to fix angles too?

Hi Zoltan

I am also looking to fix angles and dihedrals

Could you send me your scripts.

Thank You

Even I am looking to do the same. Could you please send me the scripts too? Thanks!