From within the project select "QB Actions" from the menu.

Click "Search and Select" to choose a line item.

To add more line items, click the plus sign after filling in the current line item details.

After all line items, click "Create Estimate"

To view estimates, select "View Estimates" from the "QB Actions" menu.

To add additional line items, select "Edit this estimate." Keep in mind that while you can add additional line items, you cannot remove the originals. You can delete the estimate and re-create if needed.

After adding additional line items, select "Update Estimate"

How to Create and View Quickbooks Estimates in FollowUpCRM