Declare Partial Class Part/Partial Record Part
Creates a class part/record part in a new file and makes the current class/record partial.
You can use the Declare Partial Class Part/Declare Partial Record Part refactoring in C# projects that contain file-scoped namespace declarations.
Available when the cursor is in a class or partial class for the “Declare Partial Class Part” refactoring.
The “Declare Partial Record Part” refactoring is available when the cursor is in a record or partial record.
How to Use
Place the caret in a class or partial class/record or partial record.
Press the Ctrl + . or Ctrl + ~ shortcut to invoke the Code Actions menu.
Select Declare Partial Class Part/Declare Partial Record Part from the menu.
After execution, this refactoring makes the current class/record partial and creates a file with the new part of this class/record.