I want to provide clearnce of 4 mil for BGA, while 6 mil for complete board for GND copper plane. I have tried with different polygons and priorities, but it takes same clearance rules for all the components. Please let me know how to put GND copper area with differenet clearance for BGA.
I think you need to do this in Router and not in Layout because of some oddities in how the rules are treated between the two. Search the site, because there are a lot of other posts discussing this.