When there are too many sales quotes marked as Lost or in Draft "Created" status and unwanted, there is a handy tool in the Sales Quote Dashboard to quickly select multiple sales quotes and delete them in one easy operation.
There is a Row Selection check box on the left of the Sales Quote Dashboard, as shown below.
Tick the checkbox for each sales quote that you would like to delete, as shown in the example below.
Click on the Actions button, as shown below.
Select the option Delete Seleted.
The selected sales quotes will now be deleted.