I want to be able to add the contents of selected cells within column C only
when the contents of the cells in Column A meet condition 1 and the contents
of the cells in column B meet condition 2. For example, if column A contains
Status (Completed or Not Completed), column B contains an implementation date
and column C contains the number of printers to be deployed, then I want to
be able to derive the total number of printers deployed where the status is
'Completed' and the implementation date falls within a specified week.

Can anyone suggest how I might best achieve this?