Users can manually create their number series by typing the estimate number in the Estimate #. 

1. Click on Estimate 
2. Click on the '+' sign to generate a new estimate
3. Manually add estimate number in estimate#, e.g., Moon Estimate 1
4. Enter other estimate details and click on 'Save.'

After creating an estimate series, all the upcoming estimates will be saved in the succeeding number—for example, Moon Estimate 2, Moon Estimate 3, and so on.