O que você parece estar procurando é a parte GROUP BY de um SELECT, assim:
SELECT DISTINCT company_report.*, floor(sum(variable_value)) as totalSum
FROM company_report
JOIN company ON company_report.special_id = company.special_id
JOIN users ON company.id = users.company_id
JOIN club ON users.id = club.users_id
JOIN club_offer ON club.id = club_offer.club_id
JOIN club_offer_cpv ON club_offer.id = club_offer_id
AND club_offer_cpv.cpv_id LIKE '66%'
AND company_report.variable_code IN ('AOP 201','AOP 605')
AND company_report.report_year = 2013
GROUP BY company_report.variable_code
É isso?
