Summarize and total data from another sheet

Please see attached to demonstrate what I am working with.

Using the Project Estimate sheet, I am trying to create a summary sheet.

In column A of my sheet named "Summary", I need to search the set of data from the sheet named Project Estimate that lists position titles, and input 1 of each unique value. This will be a different set of data/role every time, so the Summary sheet can not be pre-populated with roles. It needs to read everything on the Project Estimate sheet, identify all of the unique roles, and then put 1 of each in a cell on the Summary sheet. The important thing to note is that it must only list the roles that start with " - ". So for example in column A, it needs to exclude Video Phase, Copy Editing, Creative Design, Design Development, Artwork and Project Management, and only will from the other cells that start with " - ". These will be in different rows every time as you can see from the other columns, so it needs to be based on the text/value, not the cell name/range.

Then in column B of my sheet named "Summary, I need to total the numbers in Column B of the "Project Estimate" sheet next to each role.
So in my sheet named "Summary", I have included 1 example. I would want this formula to be able to identify that Project Manager Senior has 30 hours across all the data in Project Estimate

What would I need to input in my Summary sheet to get this to work?

Thanks so much