Volume Variation applys to Service Sector Help Please

System

Hello Everyone<BR><BR>Every time when I try to do the activities of the Volume variance of service sectors, I very confused the total volume variance with the capacity variance. I found it is very hard to identify the output of service sectors. <BR><BR>Could any one help will be very appreciated? <BR><BR>Thanks in advance.<BR><BR>Best regards,<BR><BR>Yanling