Changing values based on drop down menu selection

Attached is the file i am working with. The table spanning from A:AA5:16 contains hours worked per day of the week with respect to the Project chosen from the drop down menus in A7:16. Cells in the range of F,K,O,R,U,X,AA7:16 total those hours worked on a daily basis.
The table below should sum the total hours worked per day according to the Project selected in A19 from the drop down menu, with respect to the Project(s) chosen in cell range A7:16.
For example, if i am looking for total hours worked Monday on Project RSB i select "RSB" from the drop down menu in cell A19, i want cell F18:19 to be the sum of cells A7 and A9, with respect to the Project selected from cells A7:16.
If I select "FRG" from the drop down in cell A19, i want cell F18:19 to reflect the sum of cells F8 and F10.

Thank you, preemptively, for any help with this problem.