Hi
the standard salesquote query provides parameters to filter returned quotes based on their items
but I do not understand what do you mean with "Customer Project" or "Customer Project Task". Is that a standard field in the item? Or a custom field that you added?
Anyway if your functionality is provided via an OVS, you can open this OVS in the UI Editor, and try to understand where the data are retrieved (SADL query?).
In case the query/bo are not visible, you can ask to SAP a PSM release of that object.