TOPIC: PMP Application for PMO function

Dear all,
I am currently working as PMO for a international company. My main function is to qualify and approve CAPEX projets for all company entites and to support/challenge them form Initate to closing phase (400 projects a year; total of 50M€ per year). Example of my activities I challenge the project charter, project scope, profitability, business case, procurment plan, project execution, project closing. I am also steco member. I am not sure how I can use this experience for my PMP application.
Can I use this exerience for PMP application ? How can I fill out the application form (Especially for Project Title) ? I hope I will not have to enter the 400 projets...
Thank you for your help.