Use of Member Offsets are not allowed for Cable members in STAAD.Pro.
For more details, please refer to the Notes mentioned under Section 1.18.2.8 - Advanced Non-Linear Cable Analysis, of Technical Reference Help Manual of STAAD.Pro.
For more details, please refer to the Notes mentioned under Section 1.18.2.8 - Advanced Non-Linear Cable Analysis, of Technical Reference Help Manual of STAAD.Pro.