You can add relations to sections while you are in Sketcher mode. Relations in Sketcher mode follow the same rules as in Part mode, except the parameters must belong to a model and cannot be created in Sketcher mode. The relations apply to the section, but you can modify and use them in part or assembly relations.

You can also enter a section relation when you modify the driven dimension. Enter the relation (for example, sd4=sd2+sd3/2) when you are modifying dimension values. The new relation is displayed and you are prompted to accept it.

When you add the relation, use dimension symbols as follows: sd# for normal Sketcher dimensions, rsd# for reference Sketcher dimensions, and kd# for known dimensions.