I can share some information about vendor estimates, @RachelLu. 

Are you referring to vendor estimates? Can you tell us more about it? This will surely help us provide an accurate solution to the concern you're having.

If you're referring to an estimate that you can provide to your vendors, you can create a purchase order to your vendors. This is how you tell your vendors what you want to order. 

In QuickBooks Desktop (QBDT), you can go to the Preference to turn this feature on. Once done, you can go to the Vendors menu to start creating purchase orders. 

Follow the following steps to turn on this feature:

1. Go to the Edit menu to access Preferences.
2. Select Items & Inventory, then proceed to the Company Preferences tab.
3. Tick the checkbox beside Inventory and purchase orders are active and select OK.

Once done, you can now start creating a purchase order from the Vendors menu.

Here's how:

1. Go to Vendors menu and click on Create Purchase Orders.
2. In the Vendor dropdown, select the vendor you'd like to create a purchase order for. 
3. Provide all the necessary information. 
4. Click on Save & Close once you're done. 

Check out this article for more information about creating and tracking your purchase order: Create purchase orders in QuickBooks Desktop. 

If you're referring to QuickBooks Online (QBO), here's how you can create and send purchase orders in QuickBooks Online. It'll guide you with turning on the purchase order feature, creating, sending, and updating the status. 

Once you receive your inventory, here's how you can record it in your QBDT: Receive inventory. 

Let us know if you need more information about your vendor estimates. I'm always here to assist. Have a wonderful day!