Good afternoon, ushuaia_22!

Hope your day is going well so far! I'll share insights about bills and expenses in QBO.

The bill and expense transactions are not visible to your clients, and if you make them billable, only the item information will appear on their invoices. You can try making billable bills or expenses and creating an invoice out of them. Then, click Print Preview on the invoice transaction to see the things that are visible to your client.

As for your other question, estimates or quotes are only available for clients or customers. If want to inform your vendor about the things you want to buy ahead of time, you can send them a Purchase Order instead.

On the other hand, if you've created an estimate for a client for a certain item that you also need to buy from a vendor, you can directly copy the estimate to a purchase order.

Please don't hesitate to reach back out if you have other questions in mind. Take care!