Please use the following steps to create a custom Report
SMP Console > Reports > Custom Reports > Right Click > New > Report > SQL Report
Paste the following SQL query within Parameterised Query Section
-- To list clients with assigned task server Name
select ctr._ResourceGuid, vc.Name, vc.[IP Address],
vcx.Name as [Task Server], ctr.IsActive, ctr.LastRegistered
from vComputerEx vc
inner join [Inv_Client_Task_Resources] ctr (nolock) on ctr._ResourceGuid= vc.Guid
inner join vComputerEx vcx on ctr.ClientTaskServerGuid = vcx.Guid
where vc.IsManaged =1
Order by [task server]
Title: Report: To list count of assigned clients for each Task server.
http://www.symantec.com/docs/HOWTO84982
Title: Report: To list all ACTIVE Task Servers
http://www.symantec.com/docs/HOWTO61271