How obtain accurate total of hours estimated of all subtasks that are a certain type?



We have a project plan and of course there are many tasks with subtasks underneath each task

Example:
Task Estimated Work Hours Actual Work Hours Task type

Overall Project

Data entry screen 32 14
Define Requirements 8 5 Requirement
Write Specification 8 6 Spec
Perform Coding 8 3 Coding
Conduct Testing 8 0 Testing

+Reporting 40 24
Define Requirements 16 15 Requirement
Write Specification 8 6 Spec
Perform Coding 8 3 Coding
Conduct Testing 8 0 Testing


Question: When we perform a filter on the TASK TYPE column and select "Spec" WE STILL have the same total of hours (32,24 respectively) at the task level and even at a roll-up project level..
We want to determine how many hours total are "Spec" related for these 2 tasks.

Any way to do this without exporting it to Excel or without adding up the columns manually that have the word "Spec" in that column?

Thank you
Peter