Creating new sync rule

Hello

I want to creat new sync rules for all sql clients. I created hostgroup template and added servicesset to it. Now i need to create new import from vm. How do i do it correctly?

In property of sync vm rules i put the name of the Vcenter> on Destination Field i put custom vars i guess??> on source Columm i out SQL ??> set basic on filter i put Yes??? > and on Filter Expression what do i put in ?

How do i say to sync rule to import all clients from sql cluster ?? or if there is Custom Attributes named SQL > PRD or non PRD