Given a project name, extract the 5 largest costs associated with it

I have a large table of projects (project A, project B...etc.) and need to extract the 5 largest costs associated with those projects. The table is laid out as follows

Project A Task Name Task Description Cost
Project B Task Name Task Description Cost
Project A Task Name Task Description Cost
Project C Task Name Task Description Cost
Project B Task Name Task Description Cost
etc.

And, given a random project name, I need to extract the 5 largest costs.

For example,
Project Name: Project A
25,000
22,500
20,000
15,000
7,000


Is there any way to do this? It should also be noted that the table is saved on another file to the one that I'm needing this calculation on.

Thanks