You have several separate Microsoft 365 Copilot conversations.

In Microsoft 365 Copilot, notebooks are designed to organize related work into a single, reusable workspace. A notebook can group multiple Copilot conversations and associate them with shared reference materials (for example, the same set of files, links, or notes). This directly addresses both requirements in the question: (1) making conversations easier to find by collecting them in one place, and (2) enabling those conversations to use the same reference sources for grounding and continuity.

An agent is best when you want a specialized Copilot experience with predefined instructions, capabilities, and (optionally) a configured knowledge source. However, an agent does not primarily function as a “container” to gather and organize multiple existing conversations.

A page is used to capture and edit output (such as a generated report) for collaboration, not to organize multiple conversations with shared references. An app is a broader product surface and does not solve the conversation organization requirement.

Therefore, the best solution is to use a notebook .