I am trying to customize the available statuses for various work item types in my on premises Team Found Server 2018 installation. I cannot find any detailed instructions on how to do this. I have done this in other versions and it was very simple. Any information on how this can be accomplished would be greatly appreciated.
TFS 2018 uses XML process templates. Detailed information you find here: Customize a process template. Additionally, you can use Process Template Editor extension for Visual Studio that you can find here TFS Process Template Editor or through VS Extensions:
TFS Process Template Editor makes the edit process more easy. Here you can the video: Customize Team Foundation Server Process
You can open find the Process editor
menu item and open a work item type from an existing team project:
Select it from the list:
You can find and edit the states of the work item on the Workflow page:
Add new states and transitions between them with toolbox:
Then just press the save button.