Summarise data from multiple task types to single task types

Attached is an example of a raw data report which produces data on time spent on various tasks each week by a group or people.

The report is produced each month - so there are 4 weeks of data represented on each report for each person.

There are standard tasks, which may appear on the report 4 times (once for each week), and there are general tasks which may appear one or more times in a given week, for one or more people, or not at all for anyone.
New tasks may also get added during a period.

Each task also shows the amount of time spent on it.

What I need is to consolidate all this data into a summary report which will show for each person:

- each task type they were involved with - but only ONCE i.e. 4 x "Administration" showing only as 1 x "Administration"

- show only the TOTAL amount of time associated with the multiple instances of that same task e.g. total of all "Administration" (Admin x 4 hrs plus Admin x 7 hrs, plus etc)

The sample sheet attached shows the original raw data report sheet, and a simplified (summary) report sheet reflecting what it should look like (i.e. with only unique entries per person along with their accumulated totals for each), once it has been processed.

I normally have a shot at this myself but with this one I have no idea even how to approach it let alone start it. All help appreciated.