Create Input Variable Constraints
Define an inequality constraint condition that is a function of only the input variables.
Input variable constraints can be evaluated when performing any solver execution, therefore they can be treated in a special way to ensure that no evaluations are generated that violate the condition.
For example, you can fill a space that ensures that no design violates the condition, or an optimizer can avoid generating evaluation runs that would be known to generate a solver failure.
Input variable constraints should primarily be used to preemptively avoid a solver failure. If the solver can run, the optimizer will frequently perform better using normal optimization constraints.
 In the Define Input Variables step, click the Constraints tab.

Click Add Constraint.
A new constraint is created and added to the list of constraints.
 In the Label field, enter a name for the constraint.

In the Left Expression and Right Expression fields, specify expressions to
compare in the following ways:
 Manually enter an expression.
 Click to create an expression using the Expression Builder dialog.

In the Comparison field, select a comparison type.
 >= Greater than or equal to
 <= Less than or equal to