Add up my week hours from selected schedules

I would like to have my day schedule to be linked to its day hours so that it produces my total week hours.For example: Schedule is selected from drop down list which is connected by data validation from 'Support Sheet', column "Schedules". Next to each Schedule is its Hours. I would like its Hours to correspond to its Schedule so that when it is selected from drop down list on 'database sheet' it will add all the day Schedule Hours to be populated automatically into "week hours" column.I have tried to use Function Sumif= but it only allows me to put one drop down cell in the function as criteria. I tried Sumifs= which uses multiple criteria but won't work, just sums to 0.