HOW TO ISOLATE COMPONENT FROM DIFFERENT SUB-ASSEMBLIES FOR DIMENSIONING IN MAIN-ASSEMBLIY?

I AM TRYING TO DIMENSION A LARGE ASSEMBLY.I NEED TO DIMENSION THE RELATION BETWEEN 2 COMPONENTS.BUT DUE TO LARGE NUMBER OF COMPONENTS PRESENT IN ASSEMBLY WHILE DIMENSIONING ITS HARD.IS THERE ANY WAY COMPONENTS CAN BE ISOLATED FOR DIMENSIONING?
RN AM HIDING ALL THE NON REQUIRED COMPONENTS BUT ITS SO TIME CONSUMING?