In Finance and Operations system provide you unique number feature for new record that has been created known as Number Sequence.In most of the cases it is provided by system wherever it is necessary,and it also possible to use existing number sequence using environment only. When you create new module there you might need to setup new number sequence exclusive for that module.In such cases we might need to consider custom number sequence development,so in this blog we will see how to achieve that. In D365 Fo number sequence development is same as that of Ax 2012 but instead of over layering we have to achieve that using extension.Following diagram will help you to get overview of development. following are the steps which need to be performed and screenshots are also there for better understanding. Steps:- 1. Create an extension of NumberSeqModule Base Enum and add a new element and name it with our Module name and label as well...