M. To drop the associated physical model
To remove the associated physical model from the current STAAD input file, use the following procedure.
When a physical model is associated with a STAAD input file, many tools in the Analytical Modeling workflow as well as portions of the input file in the STAAD.Pro Editor are disabled. This is intended to prevent making changes which would potentially corrupt the association between the physical and analytical models. However, there are times when you may need to drop this association to make changes to the analytical model.