I am talking assembly constraints. The assembly file has multiple arrangements whose usage of components over lap into one another. The components are assigned to layers. My practice is to assign the constraints to the same layer as the component and I can find specific constraints thru other query options. I can change the Hi Lite color for 'preselection' and 'selection' but I rather simplify the process with a uniform constrain color and Hi Liting from the assembly navigator. thank you for your response