“To support your department-specific tasks, you can use a variety of general business functionality, such as Workflow and Office Integration, which is available across two or more departments”
|Set up and use workflows that connect tasks performed by different users or by the system, such as automatic posting. Requesting and granting approval to create or post documents are typical workflow steps.
Source Business Functionality https://msdn.microsoft.com/en-us/library/hh879076(v=nav.90).aspx
Workflow “How-To” (Microsoft Definition)
In the Workflow window, you create a workflow by listing the involved steps on the lines. Each step consists of a workflow event, moderated by event conditions, and a workflow response, moderated by response options. You define workflow steps by filling fields on workflow lines from fixed lists of event and response values representing scenarios that are supported by the application code.
The generic version of Microsoft Dynamics NAV includes a number of preconfigured workflows, listed in the Workflow Templates window, that you can copy to create workflows. The codes for workflow templates that are added by Microsoft are prefixed with “MS-“.
If a business scenario requires a workflow event or response that is not supported, a Microsoft partner must implement them by customizing the application code.
|The Document Approvals feature that existed in the previous version of Microsoft Dynamics NAV is removed. The standard approvals scenarios that were supported in the previous version are now supported as workflows for sales approvals and purchase approvals respectively. The upgrade tool will recreate document approval data in previous versions as workflow data in Microsoft Dynamics NAV 2016.
Source: NAV 2016 on MSDN Online
Source: NAV 2016 Workflow landing page
if you are Microsoft Partner you can find others information and document about workflow also on Microsoft Dynamics Learning Portal
|Set up workflow users, specify how users get notified, and create new workflows. For new workflows for unsupported scenarios, implement the required workflow elements by customizing the application code.
|Set Up Workflows
|Enable workflows, act on workflow notifications, including request approvals and approve requests to perform a workflow step. Archive and delete workflows.