How to find Delivery Term / field that I want in Quotation ?

Scenario: 

User would like to update Delivery Term to become a dropdown list example it can display 3 Days, 

Solution

Step 1 : If you search for Quotation in BOModel, you will not see "Delivery Term" in OwnMembers

Step 2 : But you can click on Quotation --> Refer to Base Class which under Data. Notice that it is under SalesBaseObjects

Step 3 : Search for SalesBaseObject, you will see "DeliveryTerm", update predefine value as you want 

Step 4 : Log out and Login QNE Software, you manage to select from the dropdown list   

SalesBaseObject is a sharebase table which after you amend, it will display in all transactions in Sales Module.