It looks like you want to know how to add a group and make it group #1 after you already have 2 groups. If that is the case, add the group then click on the group in the left margin (you should see a little hand) and move it to the top of the previous groups.
Also, if you want the report to give you blank values regardless of your parameter, you would need to add that within your selection criteria like:
{SMDR.Country} = [{?Country},""]
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