Stat > DOE > Mixture > Create Mixture Design > choose Extreme vertices > Components > Linear constraints
Allows you to set linear constraints for the set of components. See Setting linear constraints for extreme vertices designs for details.
Specify a coefficient for one or more components, and a value for Lower and/or Upper
Lower: Enter the lower value for the linear constraint.
A, B, C, ... : There is one row for each component in the design. Enter a coefficient for one or more of the components
Upper: Enter the upper value for the linear constraint.