not sure how to do it in PROC TABULATE. Try calculate all the values before making the table. For example, to calculate the sum for each pair of partnerid, team and class_name, use the code below:
PROC SQL;
CREATE TABLE your_table AS
SELECT partnerid, team, class_name, sum(acoumt) as Overall
FROM one
GROUP BY partnerid, team, class_name
ORDER BY partnerid, team, class_name;
QUIT;
OR you can use PROC REPORT, there is a COMPUTE block, in which you can define your own formula...