I want to use 6-311G basis set for some molecular calculations in ORCA. which flag or command I should use in ORCA input file?
You should just write ! 6-311G. For example simple input for DFT optimization of H2 molecule with PBE0 functional looks like
! PBE0 6-311G opt
*xyz 0 1
H 0 0 0
H 2 0 0
*
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