Transform your period variable to an actual SAS date variable with an appropriate format wouldn't hurt.
If you want a report use a report procedure such as proc tabulate:
proc tabulate data=have;
var var1 var2 var3;
period='' * (var1 var2 var3)*sum=''*f=best10.
/ misstext='0' box='Product'
the ='' (two single quotes) are suppressing column/row headers.
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