Following your description id=1 must have complete = 1 because 8 item-variables are non-missing.
UNTESTED CODE
data want;
set have;
if survey_number="Survey_One" then complete=nmiss(of item1-item11)<=2;
else if survey_number='Survey_Two' then complete=nmiss(of item1-item10)<=2;
run;
If you want tested code, please provide data as working SAS data step code.
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