The option is used to define additional code parameters of a steel member type. It becomes accessible by pressing the More button in the Member definition - parameters dialog box. 
You may define additional member parameters in the above-presented dialog box:
- Calculation parameters - you can type values of these parameters into fields or click the icon next to the field to select a parameter value in the additional dialog box: 
- Slenderness correction factor n 
 
- Equivalent moment coefficients my and mz 
 
  
- Section parameters (Ae/Ag ratio) 
 
- Round pipes case conditions. If the Unidirectional bending of pipes option is turned on, then, for this type of section, the program determines a bending moment equal to a sum of moments operating along axis Y and Z; the resultant moment is the basis for bar design.